diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index c6a8e31..092e2b5 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -616,7 +616,7 @@
 		-DDYNAMIC_TCL_VER=\"$(TCL_VER_LONG)\"
 TCL_OBJ	= $(OUTDIR)\if_tcl.obj
 TCL_INC	= /I "$(TCL)\Include" /I "$(TCL)"
-TCL_LIB = $(TCL)\lib\tclstub$(TCL_VER).lib
+TCL_LIB = "$(TCL)\lib\tclstub$(TCL_VER).lib"
 !else
 CFLAGS  = $(CFLAGS) -DFEAT_TCL
 TCL_OBJ	= $(OUTDIR)\if_tcl.obj
diff --git a/src/if_tcl.c b/src/if_tcl.c
index 5537b63..36ff320 100644
--- a/src/if_tcl.c
+++ b/src/if_tcl.c
@@ -79,12 +79,13 @@
 typedef struct
 {
     Tcl_Interp *interp;
+    int exitvalue;
     int range_start, range_end;
     int lbase;
     char *curbuf, *curwin;
 } tcl_info;
 
-static tcl_info tclinfo = { NULL, 0, 0, 0, NULL, NULL };
+static tcl_info tclinfo = { NULL, 0, 0, 0, 0, NULL, NULL };
 
 #define VAR_RANGE1	"::vim::range(start)"
 #define VAR_RANGE2	"::vim::range(begin)"
@@ -279,16 +280,19 @@
  ****************************************************************************/
 
 /*
- * Replace standard "exit" and "catch" commands.
+ * Replace standard "exit" command.
  *
- * This is a design flaw in Tcl -  the standard "exit" command just calls
- * exit() and kills the application.  It should return TCL_EXIT to the
- * app, which then decides if it wants to terminate or not.  In our case,
- * we just delete the Tcl interpreter (and create a new one with the next
- * :tcl command).
+ * Delete the Tcl interpreter; a new one will be created with the next
+ * :tcl command). The exit code is saved (and retrieved in tclexit()).
+ * Since Tcl's exit is never expected to return and this replacement
+ * does, then (except for a trivial case) additional Tcl commands will
+ * be run. Since the interpreter is now marked as deleted, an error
+ * will be returned -- typically "attempt to call eval in deleted
+ * interpreter". Hopefully, at this point, checks for TCL_ERROR take
+ * place and control percolates back up to Vim -- but with this new error
+ * string in the interpreter's result value. Therefore it would be
+ * useless for this routine to return the exit code via Tcl_SetResult().
  */
-#define TCL_EXIT	5
-
     static int
 exitcmd(dummy, interp, objc, objv)
     ClientData dummy UNUSED;
@@ -305,51 +309,16 @@
 		break;
 	    /* FALLTHROUGH */
 	case 1:
-	    Tcl_SetObjResult(interp, Tcl_NewIntObj(value));
-	    return TCL_EXIT;
+	    tclinfo.exitvalue = value;
+
+	    Tcl_DeleteInterp(interp);
+	    break;
 	default:
 	    Tcl_WrongNumArgs(interp, 1, objv, "?returnCode?");
     }
     return TCL_ERROR;
 }
 
-    static int
-catchcmd(dummy, interp, objc, objv)
-    ClientData	dummy UNUSED;
-    Tcl_Interp	*interp;
-    int		objc;
-    Tcl_Obj	*CONST objv[];
-{
-    char    *varname = NULL;
-    int	    result;
-
-    switch (objc)
-    {
-	case 3:
-	    varname = Tcl_GetStringFromObj(objv[2], NULL);
-	    /* fallthrough */
-	case 2:
-	    Tcl_ResetResult(interp);
-	    Tcl_AllowExceptions(interp);
-	    result = Tcl_EvalObj(interp, objv[1]);
-	    if (result == TCL_EXIT)
-		return result;
-	    if (varname)
-	    {
-		if (Tcl_SetVar(interp, varname, Tcl_GetStringResult(interp), 0) == NULL)
-		{
-		    Tcl_SetResult(interp, "couldn't save command result in variable", TCL_STATIC);
-		    return TCL_ERROR;
-		}
-	    }
-	    Tcl_SetObjResult(interp, Tcl_NewIntObj(result));
-	    return TCL_OK;
-	default:
-	    Tcl_WrongNumArgs(interp, 1, objv, "command ?varName?");
-    }
-    return TCL_ERROR;
-}
-
 /*
  *  "::vim::beep" - what Vi[m] does best :-)
  */
@@ -372,6 +341,7 @@
 /*
  *  "::vim::buffer list" - create a list of buffer commands.
  *  "::vim::buffer {N}" - create buffer command for buffer N.
+ *  "::vim::buffer exists {N}" - test if buffer N exists.
  *  "::vim::buffer new" - create a new buffer (not implemented)
  */
     static int
@@ -1663,7 +1633,7 @@
 static Tcl_ChannelType channel_type =
 {
     "vimmessage",	/* typeName */
-    NULL,		/* version */
+    TCL_CHANNEL_VERSION_2, /* version */
     channel_close,	/* closeProc */
     channel_input,	/* inputProc */
     channel_output,	/* outputProc */
@@ -1678,6 +1648,8 @@
     NULL,		/* flushProc */
     NULL,		/* handlerProc */
 #endif
+/* The following should not be necessary since TCL_CHANNEL_VERSION_2 was
+ * set above */
 #ifdef TCL_CHANNEL_VERSION_3
     NULL,		/* wideSeekProc */
 #endif
@@ -1741,7 +1713,9 @@
 	Tcl_Interp *interp;
 	static Tcl_Channel ch1, ch2;
 
-	/* replace stdout and stderr */
+	/* Create replacement channels for stdout and stderr; this has to be
+	 * done each time an interpreter is created since the channels are closed
+	 * when the interpreter is deleted */
 	ch1 = Tcl_CreateChannel(&channel_type, "vimout", VIMOUT, TCL_WRITABLE);
 	ch2 = Tcl_CreateChannel(&channel_type, "vimerr", VIMERR, TCL_WRITABLE);
 	Tcl_SetStdChannel(ch1, TCL_STDOUT);
@@ -1761,15 +1735,18 @@
 #endif
 
 	Tcl_SetChannelOption(interp, ch1, "-buffering", "line");
+#ifdef WIN3264
+	Tcl_SetChannelOption(interp, ch1, "-translation", "lf");
+#endif
 	Tcl_SetChannelOption(interp, ch2, "-buffering", "line");
+#ifdef WIN3264
+	Tcl_SetChannelOption(interp, ch2, "-translation", "lf");
+#endif
 
-	/* replace some standard Tcl commands */
+	/* replace standard Tcl exit command */
 	Tcl_DeleteCommand(interp, "exit");
 	Tcl_CreateObjCommand(interp, "exit", exitcmd,
 	    (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
-	Tcl_DeleteCommand(interp, "catch");
-	Tcl_CreateObjCommand(interp, "catch", catchcmd,
-	    (ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
 
 	/* new commands, in ::vim namespace */
 	Tcl_CreateObjCommand(interp, "::vim::buffer", buffercmd,
@@ -1821,6 +1798,8 @@
 	tclinfo.range_end = row2tcl(eap->line2);
 	tclupdatevars();
     }
+
+    tclinfo.exitvalue = 0;
     return OK;
 }
 
@@ -1884,30 +1863,23 @@
 {
     int newerr = OK;
 
-    if (error == TCL_EXIT)
+    if (Tcl_InterpDeleted(tclinfo.interp)     /* True if we intercepted Tcl's exit command */
+#if (TCL_MAJOR_VERSION == 8 && TCL_MINOR_VERSION >= 5) || TCL_MAJOR_VERSION > 8
+	|| Tcl_LimitExceeded(tclinfo.interp)  /* True if the interpreter cannot continue */
+#endif
+	)
     {
-	int retval;
 	char buf[50];
-	Tcl_Obj *robj;
 
-	robj = Tcl_GetObjResult(tclinfo.interp);
-	if (Tcl_GetIntFromObj(tclinfo.interp, robj, &retval) != TCL_OK)
+	sprintf(buf, _("E572: exit code %d"), tclinfo.exitvalue);
+	tclerrmsg(buf);
+	if (tclinfo.exitvalue == 0)
 	{
-	    EMSG(_("E281: TCL ERROR: exit code is not int!? Please report this to vim-dev@vim.org"));
-	    newerr = FAIL;
+	    did_emsg = 0;
+	    newerr = OK;
 	}
 	else
-	{
-	    sprintf(buf, _("E572: exit code %d"), retval);
-	    tclerrmsg(buf);
-	    if (retval == 0)
-	    {
-		did_emsg = 0;
-		newerr = OK;
-	    }
-	    else
-		newerr = FAIL;
-	}
+	    newerr = FAIL;
 
 	tcldelthisinterp();
     }
@@ -2021,7 +1993,12 @@
 	Tcl_SetVar(tclinfo.interp, var_line, line, 0);
 	Tcl_AllowExceptions(tclinfo.interp);
 	err = Tcl_Eval(tclinfo.interp, script);
-	if (err != TCL_OK)
+	if (err != TCL_OK
+	    || Tcl_InterpDeleted(tclinfo.interp)
+#if (TCL_MAJOR_VERSION == 8 && TCL_MINOR_VERSION >= 5) || TCL_MAJOR_VERSION > 8
+	    || Tcl_LimitExceeded(tclinfo.interp)
+#endif
+	   )
 	    break;
 	line = (char *)Tcl_GetVar(tclinfo.interp, var_line, 0);
 	if (line)
diff --git a/src/version.c b/src/version.c
index 119ad48..f9da5db 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    451,
+/**/
     450,
 /**/
     449,