Renaming File without file type breaks the file

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Renaming without file type
2. taking the file type off 
3.

What is the expected output? What do you see instead?
expect the files name to be changed and the file extension to be kept 
instead the file becomes unwriteable, unable to delete, rename, etc

What version of the product are you using? On what operating system?
Version 1.5.3 on XP

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 26 Jun 2012 at 7:44