Some filenames don't work for upload

[flashi]

Hi all...

I have a little problem while uploading pictures or the same problem when renaming filenames in admin mode:

I can't take the numbers 3 and 9 within a filename  For example, if I name a file animal03.jpg and try to upload it, it's automatically renamed to animal0_.jpg after uploading, same thing if I try to rename in admin mode. And same thing with a filename like animal09.jpg, it is renamed to animal0_.jpg, too. All other characters and numbers are ok for filenames, they won't be changed automatically to _ 

Anyone has an idea maybe what the problem could be?

Greetings,
flashi

[Nibbler]

http://coppermine-gallery.com/forum/index.php?topic=25149.0

[flashi]

Thanks a lot  Didn't find it with search option  :-\