diff --git a/src/memline.c b/src/memline.c
index 836ee04..2f08557 100644
--- a/src/memline.c
+++ b/src/memline.c
@@ -4014,6 +4014,13 @@
     else
 	retval = concat_fnames(dname, tail, TRUE);
 
+#ifdef WIN3264
+    if (retval != NULL)
+	for (t = gettail(retval); *t != NUL; mb_ptr_adv(t))
+	    if (*t == ':')
+		*t = '%';
+#endif
+
     return retval;
 }
 
@@ -4137,12 +4144,29 @@
 #ifndef SHORT_FNAME
     int		r;
 #endif
+    char_u	*buf_fname = buf->b_fname;
 
 #if !defined(SHORT_FNAME) \
-		     && ((!defined(UNIX) && !defined(OS2)) || defined(ARCHIE))
+		&& ((!defined(UNIX) && !defined(OS2)) || defined(ARCHIE))
 # define CREATE_DUMMY_FILE
     FILE	*dummyfd = NULL;
 
+# ifdef WIN3264
+    if (buf_fname != NULL && !mch_isFullName(buf_fname)
+				       && vim_strchr(gettail(buf_fname), ':'))
+    {
+	char_u *t;
+
+	buf_fname = vim_strsave(buf_fname);
+	if (buf_fname == NULL)
+	    buf_fname = buf->b_fname;
+	else
+	    for (t = gettail(buf_fname); *t != NUL; mb_ptr_adv(t))
+		if (*t == ':')
+		    *t = '%';
+    }
+# endif
+
     /*
      * If we start editing a new file, e.g. "test.doc", which resides on an
      * MSDOS compatible filesystem, it is possible that the file
@@ -4150,9 +4174,9 @@
      * this problem we temporarily create "test.doc".  Don't do this when the
      * check below for a 8.3 file name is used.
      */
-    if (!(buf->b_p_sn || buf->b_shortname) && buf->b_fname != NULL
-					     && mch_getperm(buf->b_fname) < 0)
-	dummyfd = mch_fopen((char *)buf->b_fname, "w");
+    if (!(buf->b_p_sn || buf->b_shortname) && buf_fname != NULL
+					     && mch_getperm(buf_fname) < 0)
+	dummyfd = mch_fopen((char *)buf_fname, "w");
 #endif
 
     /*
@@ -4171,7 +4195,7 @@
     if (dir_name == NULL)	    /* out of memory */
 	fname = NULL;
     else
-	fname = makeswapname(buf->b_fname, buf->b_ffname, buf, dir_name);
+	fname = makeswapname(buf_fname, buf->b_ffname, buf, dir_name);
 
     for (;;)
     {
@@ -4204,7 +4228,7 @@
 	     * It either contains two dots, is longer than 8 chars, or starts
 	     * with a dot.
 	     */
-	    tail = gettail(buf->b_fname);
+	    tail = gettail(buf_fname);
 	    if (       vim_strchr(tail, '.') != NULL
 		    || STRLEN(tail) > (size_t)8
 		    || *gettail(fname) == '.')
@@ -4273,7 +4297,7 @@
 		    {
 			buf->b_shortname = TRUE;
 			vim_free(fname);
-			fname = makeswapname(buf->b_fname, buf->b_ffname,
+			fname = makeswapname(buf_fname, buf->b_ffname,
 							       buf, dir_name);
 			continue;	/* try again with b_shortname set */
 		    }
@@ -4344,7 +4368,7 @@
 		{
 		    buf->b_shortname = TRUE;
 		    vim_free(fname);
-		    fname = makeswapname(buf->b_fname, buf->b_ffname,
+		    fname = makeswapname(buf_fname, buf->b_ffname,
 							       buf, dir_name);
 		    continue;	    /* try again with '.' replaced with '_' */
 		}
@@ -4356,7 +4380,7 @@
 	     * viewing a help file or when the path of the file is different
 	     * (happens when all .swp files are in one directory).
 	     */
-	    if (!recoverymode && buf->b_fname != NULL
+	    if (!recoverymode && buf_fname != NULL
 				&& !buf->b_help && !(buf->b_flags & BF_DUMMY))
 	    {
 		int		fd;
@@ -4433,7 +4457,7 @@
 		    {
 			fclose(dummyfd);
 			dummyfd = NULL;
-			mch_remove(buf->b_fname);
+			mch_remove(buf_fname);
 			did_use_dummy = TRUE;
 		    }
 #endif
@@ -4448,7 +4472,7 @@
 		     * user anyway.
 		     */
 		    if (swap_exists_action != SEA_NONE
-			    && has_autocmd(EVENT_SWAPEXISTS, buf->b_fname, buf))
+			    && has_autocmd(EVENT_SWAPEXISTS, buf_fname, buf))
 			choice = do_swapexists(buf, fname);
 
 		    if (choice == 0)
@@ -4549,7 +4573,7 @@
 #ifdef CREATE_DUMMY_FILE
 		    /* Going to try another name, need the dummy file again. */
 		    if (did_use_dummy)
-			dummyfd = mch_fopen((char *)buf->b_fname, "w");
+			dummyfd = mch_fopen((char *)buf_fname, "w");
 #endif
 		}
 	    }
@@ -4581,9 +4605,13 @@
     if (dummyfd != NULL)	/* file has been created temporarily */
     {
 	fclose(dummyfd);
-	mch_remove(buf->b_fname);
+	mch_remove(buf_fname);
     }
 #endif
+#ifdef WIN3264
+    if (buf_fname != buf->b_fname)
+	vim_free(buf_fname);
+#endif
     return fname;
 }
 
diff --git a/src/misc1.c b/src/misc1.c
index 2063d42..c349015 100644
--- a/src/misc1.c
+++ b/src/misc1.c
@@ -4808,9 +4808,9 @@
 
     if (fname == NULL)
 	return (char_u *)"";
-    for (p1 = p2 = fname; *p2; )	/* find last part of path */
+    for (p1 = p2 = get_past_head(fname); *p2; )	/* find last part of path */
     {
-	if (vim_ispathsep(*p2))
+	if (vim_ispathsep_nocolon(*p2))
 	    p1 = p2 + 1;
 	mb_ptr_adv(p2);
     }
@@ -4929,7 +4929,8 @@
 }
 
 /*
- * return TRUE if 'c' is a path separator.
+ * Return TRUE if 'c' is a path separator.
+ * Note that for MS-Windows this includes the colon.
  */
     int
 vim_ispathsep(c)
@@ -4952,6 +4953,20 @@
 #endif
 }
 
+/*
+ * Like vim_ispathsep(c), but exclude the colon for MS-Windows.
+ */
+    int
+vim_ispathsep_nocolon(c)
+    int c;
+{
+    return vim_ispathsep(c)
+#ifdef BACKSLASH_IN_FILENAME
+	&& c != ':'
+#endif
+	;
+}
+
 #if defined(FEAT_SEARCHPATH) || defined(PROTO)
 /*
  * return TRUE if 'c' is a path list separator.
diff --git a/src/proto/misc1.pro b/src/proto/misc1.pro
index 0354535..d6672e4 100644
--- a/src/proto/misc1.pro
+++ b/src/proto/misc1.pro
@@ -69,6 +69,7 @@
 char_u *getnextcomp __ARGS((char_u *fname));
 char_u *get_past_head __ARGS((char_u *path));
 int vim_ispathsep __ARGS((int c));
+int vim_ispathsep_nocolon __ARGS((int c));
 int vim_ispathlistsep __ARGS((int c));
 void shorten_dir __ARGS((char_u *str));
 int dir_of_file_exists __ARGS((char_u *fname));
diff --git a/src/version.c b/src/version.c
index 02cca43..615d86d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    66,
+/**/
     65,
 /**/
     64,