diff -ur tesseract-2.01/display/pgedit.cpp tesseract-2.01a/display/pgedit.cpp
--- tesseract-2.01/display/pgedit.cpp	2007-05-11 02:28:07.000000000 +0200
+++ tesseract-2.01a/display/pgedit.cpp	2007-11-21 00:39:30.000000000 +0100
@@ -797,6 +797,9 @@
 
                                  // ptr to last dot
   filename_extension = strrchr (name.string (), '.');
+  if (filename_extension == NULL)
+    filename_extension = "";     // prevent segfaults
+
   #ifdef __UNIX__
   /*    TEXTROW*                tessrows;
       TBLOB*                  tessblobs;