diff --git a/src/os_unix.h b/src/os_unix.h
index 5fc95ee..0dd75cf 100644
--- a/src/os_unix.h
+++ b/src/os_unix.h
@@ -274,9 +274,6 @@
 # endif
 #endif
 
-#if !defined(USR_EXRC_FILE2) && defined(OS2)
-# define USR_EXRC_FILE2 "$VIM/.exrc"
-#endif
 #if !defined(USR_EXRC_FILE2) && defined(VMS)
 # define USR_EXRC_FILE2 "sys$login:_exrc"
 #endif
@@ -291,20 +288,13 @@
 
 
 #if !defined(USR_VIMRC_FILE2)
-# ifdef OS2
-#  define USR_VIMRC_FILE2	"$HOME/vimfiles/vimrc"
+# ifdef VMS
+#  define USR_VIMRC_FILE2	"sys$login:vimfiles/vimrc"
 # else
-#  ifdef VMS
-#   define USR_VIMRC_FILE2	"sys$login:vimfiles/vimrc"
-#  else
-#    define USR_VIMRC_FILE2	"~/.vim/vimrc"
-#  endif
+#   define USR_VIMRC_FILE2	"~/.vim/vimrc"
 # endif
 #endif
 
-#if !defined(USR_VIMRC_FILE3) && defined(OS2)
-# define USR_VIMRC_FILE3 "$VIM/.vimrc"
-#endif
 #if !defined(USR_VIMRC_FILE3) && defined(VMS)
 # define USR_VIMRC_FILE3 "sys$login:_vimrc"
 #endif
@@ -318,14 +308,10 @@
 #endif
 
 #ifndef USR_GVIMRC_FILE2
-# ifdef OS2
-#  define USR_GVIMRC_FILE2	"$HOME/vimfiles/gvimrc"
+# ifdef VMS
+#  define USR_GVIMRC_FILE2	"sys$login:vimfiles/gvimrc"
 # else
-#  ifdef VMS
-#   define USR_GVIMRC_FILE2	"sys$login:vimfiles/gvimrc"
-#  else
-#   define USR_GVIMRC_FILE2	"~/.vim/gvimrc"
-#  endif
+#  define USR_GVIMRC_FILE2	"~/.vim/gvimrc"
 # endif
 #endif
 
@@ -347,9 +333,6 @@
 #   define VIMINFO_FILE "$HOME/.viminfo"
 #  endif
 # endif
-# if !defined(VIMINFO_FILE2) && defined(OS2)
-#  define VIMINFO_FILE2 "$VIM/.viminfo"
-# endif
 # if !defined(VIMINFO_FILE2) && defined(VMS)
 #  define VIMINFO_FILE2 "sys$login:_viminfo"
 # endif
@@ -374,74 +357,51 @@
 #endif
 
 #ifndef DFLT_BDIR
-# ifdef OS2
-#  define DFLT_BDIR     ".,c:/tmp,~/tmp,~/"
+# ifdef VMS
+#  define DFLT_BDIR    "./,sys$login:,tmp:"
 # else
-#  ifdef VMS
-#   define DFLT_BDIR    "./,sys$login:,tmp:"
-#  else
-#   define DFLT_BDIR    ".,~/tmp,~/"    /* default for 'backupdir' */
-#  endif
+#  define DFLT_BDIR    ".,~/tmp,~/"    /* default for 'backupdir' */
 # endif
 #endif
 
 #ifndef DFLT_DIR
-# ifdef OS2
-#  define DFLT_DIR      ".,~/tmp,c:/tmp,/tmp"
+# ifdef VMS
+#  define DFLT_DIR     "./,sys$login:,tmp:"
 # else
-#  ifdef VMS
-#   define DFLT_DIR     "./,sys$login:,tmp:"
-#  else
-#   define DFLT_DIR     ".,~/tmp,/var/tmp,/tmp" /* default for 'directory' */
-#  endif
+#  define DFLT_DIR     ".,~/tmp,/var/tmp,/tmp" /* default for 'directory' */
 # endif
 #endif
 
 #ifndef DFLT_VDIR
-# ifdef OS2
-#  define DFLT_VDIR     "$VIM/vimfiles/view"
+# ifdef VMS
+#  define DFLT_VDIR    "sys$login:vimfiles/view"
 # else
-#  ifdef VMS
-#   define DFLT_VDIR    "sys$login:vimfiles/view"
-#  else
-#   define DFLT_VDIR    "$HOME/.vim/view"       /* default for 'viewdir' */
-#  endif
+#  define DFLT_VDIR    "$HOME/.vim/view"       /* default for 'viewdir' */
 # endif
 #endif
 
 #define DFLT_ERRORFILE		"errors.err"
 
-#ifdef OS2
-# define DFLT_RUNTIMEPATH	"$HOME/vimfiles,$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,$HOME/vimfiles/after"
+#ifdef VMS
+# define DFLT_RUNTIMEPATH      "sys$login:vimfiles,$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,sys$login:vimfiles/after"
 #else
-# ifdef VMS
-#  define DFLT_RUNTIMEPATH      "sys$login:vimfiles,$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,sys$login:vimfiles/after"
+# ifdef RUNTIME_GLOBAL
+#  define DFLT_RUNTIMEPATH	"~/.vim," RUNTIME_GLOBAL ",$VIMRUNTIME," RUNTIME_GLOBAL "/after,~/.vim/after"
 # else
-#  ifdef RUNTIME_GLOBAL
-#   define DFLT_RUNTIMEPATH	"~/.vim," RUNTIME_GLOBAL ",$VIMRUNTIME," RUNTIME_GLOBAL "/after,~/.vim/after"
-#  else
-#   define DFLT_RUNTIMEPATH	"~/.vim,$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,~/.vim/after"
-#  endif
+#  define DFLT_RUNTIMEPATH	"~/.vim,$VIM/vimfiles,$VIMRUNTIME,$VIM/vimfiles/after,~/.vim/after"
 # endif
 #endif
 
-#ifdef OS2
-/*
- * Try several directories to put the temp files.
- */
-# define TEMPDIRNAMES	"$TMP", "$TEMP", "c:\\TMP", "c:\\TEMP", ""
-# define TEMPNAMELEN	128
-#else
-# ifdef VMS
-#  ifndef VAX
-#   define VMS_TEMPNAM    /* to fix default .LIS extension */
-#  endif
-#  define TEMPNAME       "TMP:v?XXXXXX.txt"
-#  define TEMPNAMELEN    28
-# else
-#  define TEMPDIRNAMES  "$TMPDIR", "/tmp", ".", "$HOME"
-#  define TEMPNAMELEN    256
+#ifdef VMS
+# ifndef VAX
+#  define VMS_TEMPNAM    /* to fix default .LIS extension */
 # endif
+# define TEMPNAME       "TMP:v?XXXXXX.txt"
+# define TEMPNAMELEN    28
+#else
+/* Try several directories to put the temp files. */
+# define TEMPDIRNAMES  "$TMPDIR", "/tmp", ".", "$HOME"
+# define TEMPNAMELEN    256
 #endif
 
 /* Special wildcards that need to be handled by the shell */