diff --git a/src/os_w32dll.c b/src/os_w32dll.c
new file mode 100644
index 0000000..e7ba99b
--- /dev/null
+++ b/src/os_w32dll.c
@@ -0,0 +1,27 @@
+/* vi:set ts=8 sts=4 sw=4 noet:
+ *
+ * VIM - Vi IMproved		by Bram Moolenaar
+ *
+ * Do ":help uganda"  in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ * See README.txt for an overview of the Vim source code.
+ */
+/*
+ * Windows GUI: main program (DLL) entry point:
+ *
+ * Ron Aaron <ronaharon@yahoo.com> wrote this and the DLL support code.
+ * Adapted by Ken Takata.
+ */
+#ifndef WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+
+void SaveInst(HINSTANCE hInst);
+
+BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
+{
+    if (fdwReason == DLL_PROCESS_ATTACH)
+	SaveInst(hinstDLL);
+    return TRUE;
+}