1 files changed, 5 insertions, 0 deletions
diff --git a/win/tclWinChan.c b/win/tclWinChan.c
index 6d480a8..a271919 100644
--- a/win/tclWinChan.c
+++ b/win/tclWinChan.c
@@ -840,6 +840,11 @@ TclpOpenFileChannel(
 
     nativeName = (TCHAR*) Tcl_FSGetNativePath(pathPtr);
     if (nativeName == NULL) {
+	if (interp != (Tcl_Interp *) NULL) {
+	    Tcl_AppendResult(interp, "couldn't open \"",
+	    TclGetString(pathPtr), "\": filename is invalid on this platform",
+	    NULL);
+	}
 	return NULL;
     }