diff --git a/src/GvimExt/gvimext.cpp b/src/GvimExt/gvimext.cpp
index b682b74..2b9f1ad 100644
--- a/src/GvimExt/gvimext.cpp
+++ b/src/GvimExt/gvimext.cpp
@@ -38,7 +38,7 @@
 HRESULT hres = 0;
 UINT cbFiles = 0;
 
-/* The buffers size used to be MAX_PATH (256 bytes), but that's not always
+/* The buffers size used to be MAX_PATH (260 bytes), but that's not always
  * enough */
 #define BUFSIZE 1100
 
@@ -203,7 +203,7 @@
     if (hLibintlDLL)
 	return 1;
 
-    // Load gettext library from the Vim runtime directory.
+    // Load gettext library from $VIMRUNTIME\GvimExt{64,32} directory.
     // Add the directory to $PATH temporarily.
     len = GetEnvironmentVariableW(L"PATH", NULL, 0);
     len2 = MAX_PATH + 1 + len;
@@ -212,7 +212,11 @@
     if (buf != NULL && buf2 != NULL)
     {
 	GetEnvironmentVariableW(L"PATH", buf, len);
-	_snwprintf(buf2, len2, L"%S;%s", dir, buf);
+#ifdef _WIN64
+	_snwprintf(buf2, len2, L"%S\\GvimExt64;%s", dir, buf);
+#else
+	_snwprintf(buf2, len2, L"%S\\GvimExt32;%s", dir, buf);
+#endif
 	SetEnvironmentVariableW(L"PATH", buf2);
 	hLibintlDLL = LoadLibrary(GETTEXT_DLL);
 #ifdef GETTEXT_DLL_ALT
@@ -883,37 +887,7 @@
 	return TRUE;
 }
 
-#ifdef WIN32
-// This symbol is not defined in older versions of the SDK or Visual C++.
-
-#ifndef VER_PLATFORM_WIN32_WINDOWS
-# define VER_PLATFORM_WIN32_WINDOWS 1
-#endif
-
-static DWORD g_PlatformId;
-
-//
-// Set g_PlatformId to VER_PLATFORM_WIN32_NT (NT) or
-// VER_PLATFORM_WIN32_WINDOWS (Win95).
-//
-    static void
-PlatformId(void)
-{
-    static int done = FALSE;
-
-    if (!done)
-    {
-	OSVERSIONINFO ovi;
-
-	ovi.dwOSVersionInfoSize = sizeof(ovi);
-	GetVersionEx(&ovi);
-
-	g_PlatformId = ovi.dwPlatformId;
-	done = TRUE;
-    }
-}
-
-# ifndef __BORLANDC__
+#ifndef __BORLANDC__
     static char *
 searchpath(char *name)
 {
@@ -922,28 +896,17 @@
 
     // There appears to be a bug in FindExecutableA() on Windows NT.
     // Use FindExecutableW() instead...
-    PlatformId();
-    if (g_PlatformId == VER_PLATFORM_WIN32_NT)
+    MultiByteToWideChar(CP_ACP, 0, (LPCSTR)name, -1,
+	    (LPWSTR)widename, BUFSIZE);
+    if (FindExecutableW((LPCWSTR)widename, (LPCWSTR)"",
+		(LPWSTR)location) > (HINSTANCE)32)
     {
-	MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)name, -1,
-		(LPWSTR)widename, BUFSIZE);
-	if (FindExecutableW((LPCWSTR)widename, (LPCWSTR)"",
-		    (LPWSTR)location) > (HINSTANCE)32)
-	{
-	    WideCharToMultiByte(CP_ACP, 0, (LPWSTR)location, -1,
-		    (LPSTR)widename, 2 * BUFSIZE, NULL, NULL);
-	    return widename;
-	}
-    }
-    else
-    {
-	if (FindExecutableA((LPCTSTR)name, (LPCTSTR)"",
-		    (LPTSTR)location) > (HINSTANCE)32)
-	    return location;
+	WideCharToMultiByte(CP_ACP, 0, (LPWSTR)location, -1,
+		(LPSTR)widename, 2 * BUFSIZE, NULL, NULL);
+	return widename;
     }
     return (char *)"";
 }
-# endif
 #endif
 
 STDMETHODIMP CShellExt::InvokeGvim(HWND hParent,
diff --git a/src/dosinst.c b/src/dosinst.c
index 05398be..bb95bd8 100644
--- a/src/dosinst.c
+++ b/src/dosinst.c
@@ -19,6 +19,9 @@
 #define DOSINST
 #include "dosinst.h"
 
+#define GVIMEXT64_PATH	    "GvimExt64\\gvimext.dll"
+#define GVIMEXT32_PATH	    "GvimExt32\\gvimext.dll"
+
 /* Macro to do an error check I was typing over and over */
 #define CHECK_REG_ERROR(code) if (code != ERROR_SUCCESS) { printf("%ld error number:  %ld\n", (long)__LINE__, (long)code); return 1; }
 
@@ -75,7 +78,7 @@
 {
     "\nChoose:",
     "Do not remap keys for Windows behavior",
-    "Remap a few keys for Windows behavior (<C-V>, <C-C>, etc)",
+    "Remap a few keys for Windows behavior (CTRL-V, CTRL-C, CTRL-F, etc)",
 };
 int	remap_choice = (int)remap_win;
 char	*remap_text = "- %s";
@@ -359,7 +362,6 @@
     mch_chdir(installdir);
 }
 
-#ifdef WIN3264
 /*
  * Get the value of $VIMRUNTIME or $VIM and write it in $TEMP/vimini.ini, so
  * that NSIS can read it.
@@ -612,7 +614,6 @@
 
     return foundone;
 }
-#endif
 
 /*
  * Find out information about the system.
@@ -1324,12 +1325,12 @@
     ++choice_count;
 }
 
-#if defined(WIN3264)
     static LONG
 reg_create_key(
     HKEY root,
     const char *subkey,
-    PHKEY phKey)
+    PHKEY phKey,
+    DWORD flag)
 {
     DWORD disp;
 
@@ -1337,7 +1338,7 @@
     return RegCreateKeyEx(
 		root, subkey,
 		0, NULL, REG_OPTION_NON_VOLATILE,
-		KEY_WOW64_64KEY | KEY_WRITE,
+		flag | KEY_WRITE,
 		NULL, phKey, &disp);
 }
 
@@ -1356,10 +1357,11 @@
     HKEY hRootKey,
     const char *subkey,
     const char *value_name,
-    const char *data)
+    const char *data,
+    DWORD flag)
 {
     HKEY hKey;
-    LONG lRet = reg_create_key(hRootKey, subkey, &hKey);
+    LONG lRet = reg_create_key(hRootKey, subkey, &hKey, flag);
 
     if (ERROR_SUCCESS == lRet)
     {
@@ -1375,21 +1377,22 @@
     const char *clsid,
     const char *extname,
     const char *module,
-    const char *threading_model)
+    const char *threading_model,
+    DWORD flag)
 {
     CHAR subkey[BUFSIZE];
     LONG lRet;
 
     sprintf(subkey, "CLSID\\%s", clsid);
-    lRet = reg_create_key_and_value(hRootKey, subkey, NULL, extname);
+    lRet = reg_create_key_and_value(hRootKey, subkey, NULL, extname, flag);
     if (ERROR_SUCCESS == lRet)
     {
 	sprintf(subkey, "CLSID\\%s\\InProcServer32", clsid);
-	lRet = reg_create_key_and_value(hRootKey, subkey, NULL, module);
+	lRet = reg_create_key_and_value(hRootKey, subkey, NULL, module, flag);
 	if (ERROR_SUCCESS == lRet)
 	{
 	    lRet = reg_create_key_and_value(hRootKey, subkey,
-					   "ThreadingModel", threading_model);
+					   "ThreadingModel", threading_model, flag);
 	}
     }
     return lRet;
@@ -1400,13 +1403,15 @@
     HKEY hRootKey,
     const char *clsid,
     const char *name,
-    const char *exe_path)
+    const char *exe_path,
+    DWORD flag)
 {
     LONG lRet = reg_create_key_and_value(
 	    hRootKey,
 	    "*\\shellex\\ContextMenuHandlers\\gvim",
 	    NULL,
-	    clsid);
+	    clsid,
+	    flag);
 
     if (ERROR_SUCCESS == lRet)
     {
@@ -1414,7 +1419,8 @@
 		HKEY_LOCAL_MACHINE,
 		"Software\\Microsoft\\Windows\\CurrentVersion\\Shell Extensions\\Approved",
 		clsid,
-		name);
+		name,
+		flag);
 
 	if (ERROR_SUCCESS == lRet)
 	{
@@ -1422,7 +1428,8 @@
 		    HKEY_LOCAL_MACHINE,
 		    "Software\\Vim\\Gvim",
 		    "path",
-		    exe_path);
+		    exe_path,
+		    flag);
 	}
     }
     return lRet;
@@ -1431,7 +1438,8 @@
     static LONG
 register_openwith(
     HKEY hRootKey,
-    const char *exe_path)
+    const char *exe_path,
+    DWORD flag)
 {
     char	exe_cmd[BUFSIZE];
     LONG	lRet;
@@ -1441,7 +1449,8 @@
 	    hRootKey,
 	    "Applications\\gvim.exe\\shell\\edit\\command",
 	    NULL,
-	    exe_cmd);
+	    exe_cmd,
+	    flag);
 
     if (ERROR_SUCCESS == lRet)
     {
@@ -1455,7 +1464,7 @@
 	for (i = 0; ERROR_SUCCESS == lRet
 			   && i < sizeof(openwith) / sizeof(openwith[0]); i++)
 	{
-	    lRet = reg_create_key_and_value(hRootKey, openwith[i], NULL, "");
+	    lRet = reg_create_key_and_value(hRootKey, openwith[i], NULL, "", flag);
 	}
     }
 
@@ -1470,14 +1479,13 @@
     const char *uninstall_string)
 {
     LONG lRet = reg_create_key_and_value(hRootKey, appname,
-						 "DisplayName", display_name);
+			     "DisplayName", display_name, KEY_WOW64_64KEY);
 
     if (ERROR_SUCCESS == lRet)
 	lRet = reg_create_key_and_value(hRootKey, appname,
-					 "UninstallString", uninstall_string);
+		     "UninstallString", uninstall_string, KEY_WOW64_64KEY);
     return lRet;
 }
-#endif /* WIN3264 */
 
 /*
  * Add some entries to the registry:
@@ -1489,7 +1497,6 @@
     static int
 install_registry(void)
 {
-#ifdef WIN3264
     LONG	lRet = ERROR_SUCCESS;
     const char	*vim_ext_ThreadingModel = "Apartment";
     const char	*vim_ext_name = "Vim Shell Extension";
@@ -1497,40 +1504,59 @@
     char	vim_exe_path[BUFSIZE];
     char	display_name[BUFSIZE];
     char	uninstall_string[BUFSIZE];
+    int		i;
+    int		loop_count = is_64bit_os() ? 2 : 1;
+    DWORD	flag;
 
     sprintf(vim_exe_path, "%s\\gvim.exe", installdir);
 
     if (install_popup)
     {
 	char	    bufg[BUFSIZE];
-	struct stat st;
-
-	if (stat("gvimext.dll", &st) >= 0)
-	    sprintf(bufg, "%s\\gvimext.dll", installdir);
-	else
-	    /* gvimext.dll is in gvimext subdir */
-	    sprintf(bufg, "%s\\gvimext\\gvimext.dll", installdir);
 
 	printf("Creating \"Edit with Vim\" popup menu entry\n");
 
-	lRet = register_inproc_server(
-	    HKEY_CLASSES_ROOT, vim_ext_clsid, vim_ext_name,
-						bufg, vim_ext_ThreadingModel);
-	if (ERROR_SUCCESS != lRet)
-	    return FAIL;
-	lRet = register_shellex(
-	    HKEY_CLASSES_ROOT, vim_ext_clsid, vim_ext_name, vim_exe_path);
-	if (ERROR_SUCCESS != lRet)
-	    return FAIL;
+	for (i = 0; i < loop_count; i++)
+	{
+	    if (i == 0)
+	    {
+		sprintf(bufg, "%s\\" GVIMEXT32_PATH, installdir);
+		flag = KEY_WOW64_32KEY;
+	    }
+	    else
+	    {
+		sprintf(bufg, "%s\\" GVIMEXT64_PATH, installdir);
+		flag = KEY_WOW64_64KEY;
+	    }
+
+	    lRet = register_inproc_server(
+		    HKEY_CLASSES_ROOT, vim_ext_clsid, vim_ext_name,
+		    bufg, vim_ext_ThreadingModel, flag);
+	    if (ERROR_SUCCESS != lRet)
+		return FAIL;
+	    lRet = register_shellex(
+		    HKEY_CLASSES_ROOT, vim_ext_clsid, vim_ext_name,
+		    vim_exe_path, flag);
+	    if (ERROR_SUCCESS != lRet)
+		return FAIL;
+	}
     }
 
     if (install_openwith)
     {
 	printf("Creating \"Open with ...\" list entry\n");
 
-	lRet = register_openwith(HKEY_CLASSES_ROOT, vim_exe_path);
-	if (ERROR_SUCCESS != lRet)
-	    return FAIL;
+	for (i = 0; i < loop_count; i++)
+	{
+	    if (i == 0)
+		flag = KEY_WOW64_32KEY;
+	    else
+		flag = KEY_WOW64_64KEY;
+
+	    lRet = register_openwith(HKEY_CLASSES_ROOT, vim_exe_path, flag);
+	    if (ERROR_SUCCESS != lRet)
+		return FAIL;
+	}
     }
 
     printf("Creating an uninstall entry\n");
@@ -1554,7 +1580,6 @@
 	uninstall_string);
     if (ERROR_SUCCESS != lRet)
 	return FAIL;
-#endif /* WIN3264 */
 
     return OK;
 }
@@ -1584,12 +1609,8 @@
     struct stat	st;
 
     if (has_gvim
-	    && (stat("gvimext.dll", &st) >= 0
-		|| stat("gvimext/gvimext.dll", &st) >= 0)
-#ifndef WIN3264
-	    && searchpath("regedit.exe") != NULL
-#endif
-       )
+	    && (stat(GVIMEXT32_PATH, &st) >= 0
+		|| stat(GVIMEXT64_PATH, &st) >= 0))
     {
 	choices[choice_count].changefunc = change_popup_choice;
 	choices[choice_count].installfunc = NULL;
@@ -1623,11 +1644,7 @@
     static void
 init_openwith_choice(void)
 {
-    if (has_gvim
-#ifndef WIN3264
-	    && searchpath("regedit.exe") != NULL
-#endif
-       )
+    if (has_gvim)
     {
 	choices[choice_count].changefunc = change_openwith_choice;
 	choices[choice_count].installfunc = NULL;
@@ -1639,7 +1656,6 @@
 	add_dummy_choice();
 }
 
-#ifdef WIN3264
 /* create_shortcut
  *
  * Create a shell link.
@@ -1935,21 +1951,16 @@
 	alloc_text(idx, "Create a desktop icon for %s", arg);
     }
 }
-#endif /* WIN3264 */
 
     static void
 init_startmenu_choice(void)
 {
-#ifdef WIN3264
     /* Start menu */
     choices[choice_count].changefunc = toggle_startmenu_choice;
     choices[choice_count].installfunc = NULL;
     choices[choice_count].active = 1;
     toggle_startmenu_choice(choice_count);	/* set the text */
     ++choice_count;
-#else
-    add_dummy_choice();
-#endif
 }
 
 /*
@@ -1958,7 +1969,6 @@
     static void
 init_shortcut_choices(void)
 {
-#ifdef WIN3264
     /* Shortcut to gvim */
     choices[choice_count].text = NULL;
     choices[choice_count].arg = 0;
@@ -1985,14 +1995,8 @@
     choices[choice_count].installfunc = install_shortcut_gview;
     toggle_shortcut_choice(choice_count);
     ++choice_count;
-#else
-    add_dummy_choice();
-    add_dummy_choice();
-    add_dummy_choice();
-#endif
 }
 
-#ifdef WIN3264
 /*
  * Attempt to register OLE for Vim.
  */
@@ -2004,16 +2008,9 @@
     printf("\n--- Attempting to register Vim with OLE ---\n");
     printf("(There is no message whether this works or not.)\n");
 
-#ifndef __CYGWIN__
     sprintf(register_command_string, "\"%s\\gvim.exe\" -silent -register", installdir);
-#else
-    /* handle this differently for Cygwin which sometimes has trouble with
-     * Windows-style pathnames here. */
-    sprintf(register_command_string, "./gvim.exe -silent -register");
-#endif
     system(register_command_string);
 }
-#endif /* WIN3264 */
 
 /*
  * Remove the last part of directory "path[]" to get its parent, and put the
@@ -2212,19 +2209,15 @@
     printf("    Install the Edit-with-Vim context menu entry\n");
     printf("-install-openwith\n");
     printf("    Add Vim to the \"Open With...\" context menu list\n");
-#ifdef WIN3264
     printf("-add-start-menu");
     printf("    Add Vim to the start menu\n");
     printf("-install-icons");
     printf("    Create icons for gVim executables on the desktop\n");
-#endif
     printf("-create-directories [vim|home]\n");
     printf("    Create runtime directories to drop plugins into; in the $VIM\n");
     printf("    or $HOME directory\n");
-#ifdef WIN3264
     printf("-register-OLE");
     printf("    Ignored\n");
-#endif
     printf("\n");
 }
 
@@ -2308,12 +2301,10 @@
 	    else /* No choice specified, default to vim directory */
 		vimfiles_dir_choice = (int)vimfiles_dir_vim;
 	}
-#ifdef WIN3264
 	else if (strcmp(argv[i], "-register-OLE") == 0)
 	{
 	    /* This is always done when gvim is found */
 	}
-#endif
 	else /* Unknown switch */
 	{
 	    printf("Got unknown argument argv[%d] = %s\n", i, argv[i]);
@@ -2471,11 +2462,9 @@
 	    || !interactive)
 	install_registry();
 
-#ifdef WIN3264
     /* Register gvim with OLE. */
     if (has_gvim)
 	install_OLE_register();
-#endif
 }
 
 /*
@@ -2511,7 +2500,6 @@
     /* Initialize this program. */
     do_inits(argv);
 
-#ifdef WIN3264
     if (argc > 1 && strcmp(argv[1], "-uninstall-check") == 0)
     {
 	/* Only check for already installed Vims.  Used by NSIS installer. */
@@ -2527,7 +2515,6 @@
 	    sleep(3);
 	exit(0);
     }
-#endif
 
     printf("This program sets up the installation of Vim "
 						   VIM_VERSION_MEDIUM "\n\n");
@@ -2535,11 +2522,9 @@
     /* Check if the user unpacked the archives properly. */
     check_unpack();
 
-#ifdef WIN3264
     /* Check for already installed Vims. */
     if (interactive)
 	uninstall_check(0);
-#endif
 
     /* Find out information about the system. */
     inspect_system();
diff --git a/src/dosinst.h b/src/dosinst.h
index 268a91b..59de932 100644
--- a/src/dosinst.h
+++ b/src/dosinst.h
@@ -26,19 +26,10 @@
 # include "vimio.h"
 # include <ctype.h>
 
-# ifndef __CYGWIN__
-#  include <direct.h>
-# endif
+# include <direct.h>
 
-# if defined(_WIN64) || defined(WIN32)
-#  define WIN3264
-#  include <windows.h>
-#  include <shlobj.h>
-# else
-#  include <dir.h>
-#  include <bios.h>
-#  include <dos.h>
-# endif
+# include <windows.h>
+# include <shlobj.h>
 #endif
 
 #ifdef UNIX_LINT
@@ -56,7 +47,7 @@
 #if defined(UNIX_LINT)
 # define vim_mkdir(x, y) mkdir((char *)(x), y)
 #else
-# if defined(WIN3264) && !defined(__BORLANDC__)
+# ifndef __BORLANDC__
 #  define vim_mkdir(x, y) _mkdir((char *)(x))
 # else
 #  define vim_mkdir(x, y) mkdir((char *)(x))
@@ -88,6 +79,9 @@
 # ifndef KEY_WOW64_64KEY
 #  define KEY_WOW64_64KEY 0x0100
 # endif
+# ifndef KEY_WOW64_32KEY
+#  define KEY_WOW64_32KEY 0x0200
+# endif
 
 #define VIM_STARTMENU "Programs\\Vim " VIM_VERSION_SHORT
 
@@ -134,40 +128,32 @@
     exit(n);
 }
 
-#ifdef WIN3264
-/* This symbol is not defined in older versions of the SDK or Visual C++ */
 
-#ifndef VER_PLATFORM_WIN32_WINDOWS
-# define VER_PLATFORM_WIN32_WINDOWS 1
-#endif
-
-static DWORD g_PlatformId;
-
+typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS)(HANDLE, PBOOL);
 /*
- * Set g_PlatformId to VER_PLATFORM_WIN32_NT (NT) or
- * VER_PLATFORM_WIN32_WINDOWS (Win95).
+ * Check if this is a 64-bit OS.
  */
-    static void
-PlatformId(void)
+    static BOOL
+is_64bit_os(void)
 {
-    static int done = FALSE;
+#ifdef _WIN64
+    return TRUE;
+#else
+    BOOL bIsWow64 = FALSE;
+    LPFN_ISWOW64PROCESS pIsWow64Process;
 
-    if (!done)
-    {
-	OSVERSIONINFO ovi;
-
-	ovi.dwOSVersionInfoSize = sizeof(ovi);
-	GetVersionEx(&ovi);
-
-	g_PlatformId = ovi.dwPlatformId;
-	done = TRUE;
-    }
+    pIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress(
+	    GetModuleHandle("kernel32"), "IsWow64Process");
+    if (pIsWow64Process != NULL)
+	pIsWow64Process(GetCurrentProcess(), &bIsWow64);
+    return bIsWow64;
+#endif
 }
 
-# ifdef __BORLANDC__
+#ifdef __BORLANDC__
 /* Borland defines its own searchpath() in dir.h */
-#  include <dir.h>
-# else
+# include <dir.h>
+#else
     static char *
 searchpath(char *name)
 {
@@ -176,28 +162,17 @@
 
     /* There appears to be a bug in FindExecutableA() on Windows NT.
      * Use FindExecutableW() instead... */
-    PlatformId();
-    if (g_PlatformId == VER_PLATFORM_WIN32_NT)
+    MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)name, -1,
+	    (LPWSTR)widename, BUFSIZE);
+    if (FindExecutableW((LPCWSTR)widename, (LPCWSTR)"",
+		(LPWSTR)location) > (HINSTANCE)32)
     {
-	MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)name, -1,
-		(LPWSTR)widename, BUFSIZE);
-	if (FindExecutableW((LPCWSTR)widename, (LPCWSTR)"",
-		    (LPWSTR)location) > (HINSTANCE)32)
-	{
-	    WideCharToMultiByte(CP_ACP, 0, (LPWSTR)location, -1,
-		    (LPSTR)widename, 2 * BUFSIZE, NULL, NULL);
-	    return widename;
-	}
-    }
-    else
-    {
-	if (FindExecutableA((LPCTSTR)name, (LPCTSTR)"",
-		    (LPTSTR)location) > (HINSTANCE)32)
-	    return location;
+	WideCharToMultiByte(CP_ACP, 0, (LPWSTR)location, -1,
+		(LPSTR)widename, 2 * BUFSIZE, NULL, NULL);
+	return widename;
     }
     return NULL;
 }
-# endif
 #endif
 
 /*
@@ -217,7 +192,6 @@
     return s;
 }
 
-#ifdef WIN3264
 
 #ifndef CSIDL_COMMON_PROGRAMS
 # define CSIDL_COMMON_PROGRAMS 0x0017
@@ -355,7 +329,6 @@
 
     return OK;
 }
-#endif
 
 /*
  * List of targets.  The first one (index zero) is used for the default path
@@ -406,10 +379,8 @@
 	 "gVim Easy " VIM_VERSION_SHORT ".lnk",
 	 "gVim Read only " VIM_VERSION_SHORT ".lnk"};
 
-/* This is only used for dosinst.c when WIN3264 is defined and for uninstal.c
- * when not being able to directly access registry entries. */
-#if (defined(DOSINST) && defined(WIN3264)) \
-	|| (!defined(DOSINST) && !defined(WIN3264))
+/* This is only used for dosinst.c. */
+#if defined(DOSINST)
 /*
  * Run an external command and wait for it to finish.
  */
@@ -464,24 +435,9 @@
     int
 change_drive(int drive)
 {
-#ifdef WIN3264
     char temp[3] = "-:";
     temp[0] = (char)(drive + 'A' - 1);
     return !SetCurrentDirectory(temp);
-#else
-# ifndef UNIX_LINT
-    union REGS regs;
-
-    regs.h.ah = 0x0e;
-    regs.h.dl = drive - 1;
-    intdos(&regs, &regs);   /* set default drive */
-    regs.h.ah = 0x19;
-    intdos(&regs, &regs);   /* get default drive */
-    if (regs.h.al == drive - 1)
-	return 0;
-# endif
-    return -1;
-#endif
 }
 
 /*
@@ -507,7 +463,7 @@
 /*
  * Expand the executable name into a full path name.
  */
-#if defined(__BORLANDC__) && !defined(WIN3264)
+#if defined(__BORLANDC__)
 
 /* Only Borland C++ has this. */
 # define my_fullpath(b, n, l) _fullpath(b, n, l)
@@ -516,92 +472,11 @@
     static char *
 my_fullpath(char *buf, char *fname, int len)
 {
-# ifdef WIN3264
     /* Only GetModuleFileName() will get the long file name path.
      * GetFullPathName() may still use the short (FAT) name. */
     DWORD len_read = GetModuleFileName(NULL, buf, (size_t)len);
 
     return (len_read > 0 && len_read < (DWORD)len) ? buf : NULL;
-# else
-    char	olddir[BUFSIZE];
-    char	*p, *q;
-    int		c;
-    char	*retval = buf;
-
-    if (strchr(fname, ':') != NULL)	/* already expanded */
-    {
-	strncpy(buf, fname, len);
-    }
-    else
-    {
-	*buf = NUL;
-	/*
-	 * change to the directory for a moment,
-	 * and then do the getwd() (and get back to where we were).
-	 * This will get the correct path name with "../" things.
-	 */
-	p = strrchr(fname, '/');
-	q = strrchr(fname, '\\');
-	if (q != NULL && (p == NULL || q > p))
-	    p = q;
-	q = strrchr(fname, ':');
-	if (q != NULL && (p == NULL || q > p))
-	    p = q;
-	if (p != NULL)
-	{
-	    if (getcwd(olddir, BUFSIZE) == NULL)
-	    {
-		p = NULL;		/* can't get current dir: don't chdir */
-		retval = NULL;
-	    }
-	    else
-	    {
-		if (p == fname)		/* /fname		*/
-		    q = p + 1;		/* -> /			*/
-		else if (q + 1 == p)	/* ... c:\foo		*/
-		    q = p + 1;		/* -> c:\		*/
-		else			/* but c:\foo\bar	*/
-		    q = p;		/* -> c:\foo		*/
-
-		c = *q;			/* truncate at start of fname */
-		*q = NUL;
-		if (mch_chdir(fname))	/* change to the directory */
-		    retval = NULL;
-		else
-		{
-		    fname = q;
-		    if (c == '\\')	/* if we cut the name at a */
-			fname++;	/* '\', don't add it again */
-		}
-		*q = c;
-	    }
-	}
-	if (getcwd(buf, len) == NULL)
-	{
-	    retval = NULL;
-	    *buf = NUL;
-	}
-	/*
-	 * Concatenate the file name to the path.
-	 */
-	if (strlen(buf) + strlen(fname) >= len - 1)
-	{
-	    printf("ERROR: File name too long!\n");
-	    myexit(1);
-	}
-	add_pathsep(buf);
-	strcat(buf, fname);
-	if (p)
-	    mch_chdir(olddir);
-    }
-
-    /* Replace forward slashes with backslashes, required for the path to a
-     * command. */
-    while ((p = strchr(buf, '/')) != NULL)
-	*p = '\\';
-
-    return retval;
-# endif
 }
 #endif
 
diff --git a/src/uninstal.c b/src/uninstal.c
index f394117..11b6c62 100644
--- a/src/uninstal.c
+++ b/src/uninstal.c
@@ -32,10 +32,8 @@
     return (scanf(" %c", answer) == 1 && toupper(answer[0]) == 'Y');
 }
 
-#ifdef WIN3264
-
     static int
-reg_delete_key(HKEY hRootKey, const char *key)
+reg_delete_key(HKEY hRootKey, const char *key, DWORD flag)
 {
     static int did_load = FALSE;
     static HANDLE advapi_lib = NULL;
@@ -52,7 +50,7 @@
 	    delete_key_ex = (LONG (WINAPI *)(HKEY, LPCTSTR, REGSAM, DWORD))GetProcAddress(advapi_lib, "RegDeleteKeyExA");
     }
     if (delete_key_ex != NULL) {
-	return (*delete_key_ex)(hRootKey, key, KEY_WOW64_64KEY, 0);
+	return (*delete_key_ex)(hRootKey, key, flag, 0);
     }
     return RegDeleteKey(hRootKey, key);
 }
@@ -72,7 +70,9 @@
     /* Open the key where the path to gvim.exe is stored. */
     if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, "Software\\Vim\\Gvim", 0,
 		    KEY_WOW64_64KEY | KEY_READ, &key_handle) != ERROR_SUCCESS)
-	return 0;
+	if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, "Software\\Vim\\Gvim", 0,
+		    KEY_WOW64_32KEY | KEY_READ, &key_handle) != ERROR_SUCCESS)
+	    return 0;
 
     /* get the DisplayName out of it to show the user */
     r = RegQueryValueEx(key_handle, "path", 0,
@@ -111,29 +111,41 @@
 remove_popup(void)
 {
     int		fail = 0;
+    int		i;
+    int		loop = is_64bit_os() ? 2 : 1;
+    int		maxfail = loop * 6;
+    DWORD	flag;
     HKEY	kh;
 
-    if (reg_delete_key(HKEY_CLASSES_ROOT, "CLSID\\{51EEE242-AD87-11d3-9C1E-0090278BBD99}\\InProcServer32") != ERROR_SUCCESS)
-	++fail;
-    if (reg_delete_key(HKEY_CLASSES_ROOT, "CLSID\\{51EEE242-AD87-11d3-9C1E-0090278BBD99}") != ERROR_SUCCESS)
-	++fail;
-    if (reg_delete_key(HKEY_CLASSES_ROOT, "*\\shellex\\ContextMenuHandlers\\gvim") != ERROR_SUCCESS)
-	++fail;
-    if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, "Software\\Microsoft\\Windows\\CurrentVersion\\Shell Extensions\\Approved", 0,
-		      KEY_WOW64_64KEY | KEY_ALL_ACCESS, &kh) != ERROR_SUCCESS)
-	++fail;
-    else
+    for (i = 0; i < loop; i++)
     {
-	if (RegDeleteValue(kh, "{51EEE242-AD87-11d3-9C1E-0090278BBD99}") != ERROR_SUCCESS)
-	    ++fail;
-	RegCloseKey(kh);
-    }
-    if (reg_delete_key(HKEY_LOCAL_MACHINE, "Software\\Vim\\Gvim") != ERROR_SUCCESS)
-	++fail;
-    if (reg_delete_key(HKEY_LOCAL_MACHINE, "Software\\Vim") != ERROR_SUCCESS)
-	++fail;
+	if (i == 0)
+	    flag = KEY_WOW64_32KEY;
+	else
+	    flag = KEY_WOW64_64KEY;
 
-    if (fail == 6)
+	if (reg_delete_key(HKEY_CLASSES_ROOT, "CLSID\\{51EEE242-AD87-11d3-9C1E-0090278BBD99}\\InProcServer32", flag) != ERROR_SUCCESS)
+	    ++fail;
+	if (reg_delete_key(HKEY_CLASSES_ROOT, "CLSID\\{51EEE242-AD87-11d3-9C1E-0090278BBD99}", flag) != ERROR_SUCCESS)
+	    ++fail;
+	if (reg_delete_key(HKEY_CLASSES_ROOT, "*\\shellex\\ContextMenuHandlers\\gvim", flag) != ERROR_SUCCESS)
+	    ++fail;
+	if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, "Software\\Microsoft\\Windows\\CurrentVersion\\Shell Extensions\\Approved", 0,
+		    flag | KEY_ALL_ACCESS, &kh) != ERROR_SUCCESS)
+	    ++fail;
+	else
+	{
+	    if (RegDeleteValue(kh, "{51EEE242-AD87-11d3-9C1E-0090278BBD99}") != ERROR_SUCCESS)
+		++fail;
+	    RegCloseKey(kh);
+	}
+	if (reg_delete_key(HKEY_LOCAL_MACHINE, "Software\\Vim\\Gvim", flag) != ERROR_SUCCESS)
+	    ++fail;
+	if (reg_delete_key(HKEY_LOCAL_MACHINE, "Software\\Vim", flag) != ERROR_SUCCESS)
+	    ++fail;
+    }
+
+    if (fail == maxfail)
 	printf("No Vim popup registry entries could be removed\n");
     else if (fail > 0)
 	printf("Some Vim popup registry entries could not be removed\n");
@@ -145,30 +157,41 @@
 remove_openwith(void)
 {
     int		fail = 0;
+    int		i;
+    int		loop = is_64bit_os() ? 2 : 1;
+    int		maxfail = loop * 7;
+    DWORD	flag;
 
-    if (reg_delete_key(HKEY_CLASSES_ROOT, "Applications\\gvim.exe\\shell\\edit\\command") != ERROR_SUCCESS)
-	++fail;
-    if (reg_delete_key(HKEY_CLASSES_ROOT, "Applications\\gvim.exe\\shell\\edit") != ERROR_SUCCESS)
-	++fail;
-    if (reg_delete_key(HKEY_CLASSES_ROOT, "Applications\\gvim.exe\\shell") != ERROR_SUCCESS)
-	++fail;
-    if (reg_delete_key(HKEY_CLASSES_ROOT, "Applications\\gvim.exe") != ERROR_SUCCESS)
-	++fail;
-    if (reg_delete_key(HKEY_CLASSES_ROOT, ".htm\\OpenWithList\\gvim.exe") != ERROR_SUCCESS)
-	++fail;
-    if (reg_delete_key(HKEY_CLASSES_ROOT, ".vim\\OpenWithList\\gvim.exe") != ERROR_SUCCESS)
-	++fail;
-    if (reg_delete_key(HKEY_CLASSES_ROOT, "*\\OpenWithList\\gvim.exe") != ERROR_SUCCESS)
-	++fail;
+    for (i = 0; i < loop; i++)
+    {
+	if (i == 0)
+	    flag = KEY_WOW64_32KEY;
+	else
+	    flag = KEY_WOW64_64KEY;
 
-    if (fail == 7)
+	if (reg_delete_key(HKEY_CLASSES_ROOT, "Applications\\gvim.exe\\shell\\edit\\command", flag) != ERROR_SUCCESS)
+	    ++fail;
+	if (reg_delete_key(HKEY_CLASSES_ROOT, "Applications\\gvim.exe\\shell\\edit", flag) != ERROR_SUCCESS)
+	    ++fail;
+	if (reg_delete_key(HKEY_CLASSES_ROOT, "Applications\\gvim.exe\\shell", flag) != ERROR_SUCCESS)
+	    ++fail;
+	if (reg_delete_key(HKEY_CLASSES_ROOT, "Applications\\gvim.exe", flag) != ERROR_SUCCESS)
+	    ++fail;
+	if (reg_delete_key(HKEY_CLASSES_ROOT, ".htm\\OpenWithList\\gvim.exe", flag) != ERROR_SUCCESS)
+	    ++fail;
+	if (reg_delete_key(HKEY_CLASSES_ROOT, ".vim\\OpenWithList\\gvim.exe", flag) != ERROR_SUCCESS)
+	    ++fail;
+	if (reg_delete_key(HKEY_CLASSES_ROOT, "*\\OpenWithList\\gvim.exe", flag) != ERROR_SUCCESS)
+	    ++fail;
+    }
+
+    if (fail == maxfail)
 	printf("No Vim open-with registry entries could be removed\n");
     else if (fail > 0)
 	printf("Some Vim open-with registry entries could not be removed\n");
     else
 	printf("The Vim open-with registry entries have been removed\n");
 }
-#endif
 
 /*
  * Check if a batch file is really for the current version.  Don't delete a
@@ -231,7 +254,6 @@
     return found;
 }
 
-#ifdef WIN3264
     static void
 remove_if_exists(char *path, char *filename)
 {
@@ -284,12 +306,11 @@
 	}
     }
 }
-#endif
 
     static void
 delete_uninstall_key(void)
 {
-    reg_delete_key(HKEY_LOCAL_MACHINE, "Software\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\Vim " VIM_VERSION_SHORT);
+    reg_delete_key(HKEY_LOCAL_MACHINE, "Software\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\Vim " VIM_VERSION_SHORT, KEY_WOW64_64KEY);
 }
 
     int
@@ -297,7 +318,6 @@
 {
     int		found = 0;
     FILE	*fd;
-#ifdef WIN3264
     int		i;
     struct stat st;
     char	icon[BUFSIZE];
@@ -308,7 +328,6 @@
     if (argc == 2 && stricmp(argv[1], "-nsis") == 0)
 	interactive = FALSE;
     else
-#endif
 	interactive = TRUE;
 
     /* Initialize this program. */
@@ -316,7 +335,6 @@
 
     printf("This program will remove the following items:\n");
 
-#ifdef WIN3264
     if (popup_gvim_path(popup_path))
     {
 	printf(" - the \"Edit with Vim\" entry in the popup menu\n");
@@ -370,7 +388,6 @@
 	if (!interactive || confirm())
 	    remove_start_menu();
     }
-#endif
 
     printf("\n");
     found = remove_batfiles(0);
diff --git a/src/version.c b/src/version.c
index efdc5ab..a119dc8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1191,
+/**/
     1190,
 /**/
     1189,