--- mstools/samples/showdib/drawdib.c	2018/08/09 18:20:44	1.1.1.2
+++ mstools/samples/showdib/drawdib.c	2018/08/09 18:21:42	1.1.1.3
@@ -555,9 +555,11 @@ VOID SizeWindow (HWND hWnd)
 
     /* Extract the filename from the full pathname */
     pstr = achFileName + lstrlen(achFileName) - 1;
-    while ((*pstr != '\\') && (*pstr != ':') && (pstr >= achFileName))
+    while ((*pstr != '\\') && (*pstr != ':') && (pstr > achFileName))
 	    pstr--;
-    pstr++;
+
+    if(pstr != achFileName)
+            pstr++;
 
     /* Format filename along with the DIB attributes */
     sprintf (Name,