problem uploading flash files

Hi all,

I just started working with FCKEditor. It was already installed on the website application. The problem is that when I try to upload Flash files for some reason it starts the upload and it seems that it goes for ever. The file size is small under 300kb, and in the end nothing happens, no errors or anything. If I put the file directly into the right folder via ftp or whatever it works fine. When I try uploading any other file it works perfectly fine.

Is it a configuration problem or did I miss anything in the settings?

Thanks for the help