When I move rename the page which contains the attachments to another namespace, the files are not moved successfully.

For instance I try to copy the page: File:Example.png to File:Protected_Namespace:Example.png I get the warning:
Warning: rename(C:\inetpub\wwwroot\w\images\/8/8a/Hugo14.png,C:\inetpub\wwwroot\w\images\/103/8/8a/Protected_Namespace:Hugo14.png):
The filename, directory name, or volume label syntax is incorrect.
(code: 123) in C:\inetpub\wwwroot\w\includes\filerepo\FSRepo.php on line 217

I'm obviously using a IIS Server (Windows NT 6.1 build 7601 (Windows Server 2008 R2 Datacenter Edition Service Pack 1) and PHP 5.3.8.

Mediawiki 1.17 and NSFileRepo 1.4 (latest trunk: r108492)

Am I the only one experiencing this error? Might it be a bug?

http://www.mediawiki.org/w/index.php?title=User:Tschuliaen

Version: master
Severity: normal