Index: gexpose.py
===================================================================
--- gexpose.py	(revision 3190)
+++ gexpose.py	(working copy)
@@ -574,24 +574,27 @@
     start_pattern = '    //~ BEGIN GENERATED REGION -- DO NOT EDIT SEE gexpose.py'
     end_pattern =   '    //~ END GENERATED REGION -- DO NOT EDIT SEE gexpose.py'
     output = []
-    f = file(filename, 'r')
-    for line in f:
-        if line.startswith(start_pattern):
-            in_generated = True
-            start_found = True
-        elif line.startswith(end_pattern):
-            in_generated = False
-            end_found = True
-            output.append('%s\n%s\n%s\n' % (start_pattern, generated, end_pattern))
-        elif in_generated:
-            continue
-        else:
-            output.append(line)
-    f.close()
-    if not start_found:
-        raise 'pattern [%s] not found in %s' % (start_pattern, filename)
-    if not end_found:
-        raise 'pattern [%s] not found in %s' % (end_pattern, filename)
+    if os.path.exists(filename):
+	f = file(filename, 'r')
+	for line in f:
+	    if line.startswith(start_pattern):
+		in_generated = True
+		start_found = True
+	    elif line.startswith(end_pattern):
+		in_generated = False
+		end_found = True
+		output.append('%s\n%s\n%s\n' % (start_pattern, generated, end_pattern))
+	    elif in_generated:
+		continue
+	    else:
+		output.append(line)
+	f.close()
+	if not start_found:
+	    raise 'pattern [%s] not found in %s' % (start_pattern, filename)
+	if not end_found:
+	    raise 'pattern [%s] not found in %s' % (end_pattern, filename)
+    else:
+	output.append('%s\n%s\n%s\n' % (start_pattern, generated, end_pattern))
     f = file(filename, 'w')
     f.write("".join(output))
     f.close()