Another thing to try. If you can, try sending it to the player with Emplode instead of Jemplode.

If Emplode sends the file and it works, or if emplode refuses to send the file in the first place because it's protected, perhaps it's just a bug in Jemplode.

Personally, I would like to see both products (emplode and jemplode) give you a warning on bad files, but still somehow give you the option of sending the file anyway. For instance, in case I didn't have Hijack on the player and wanted to send a zipfile to the player for taxi purposes.