Standalone player doesn't

when I try to create a standalone player on a portable hard drive to move to another computer, it transfers the a/v files but does not move on to create the player. There is a file on the hard drive but when I click on it it says the file is damage and should be trashed. I am sure I am doing something wrong but I am stumped. there is plenty of space on the hard drive, although I use it mainly for PC related work.

I think the problem may be that the hard drive isn’t formatted that way so that the stand alone player can run from it. Please can you check what format the hard drive is (use the Disk Utility app by Apple) Are you able to reformat the drive to an Apple format (NOTE: if doing so, you will loose all the file that are on the drive!) ?