Well, it seems I was trying to experiment with fopen(), unlink(), and all that file creating/deleting stuff. Then I decided to add a PHP script that detects invalid characters. I didn't set it up right, tried to create a file with the name "ar;h\';.txt" and now I can't delete it; I can't erase it via my FileZilla, my own control panel, or the ULMB File Manager. And I'm sure that the backward-slash is causing all the problem. Is it okay if it can be deleted, please?

Thanks in advance.
BTW,
ar;h\';.txt file is located in my server under temp/cchs_asb/data/media.