Moved from General Discussion to phpBB Discussion.
If I remember correctly, this was done for security purposes. It's not just images, but all file extensions that are allowed (defined in the ACP). So any file uploaded with the attachment feature will have the extension "removed" and given a hash value.
Also, please keep in mind that this is an english-speaking board. Your translated text in another language is not needed.
Flying is the second best thrill to cheerleaders; being caught is the first.