As it turned out the problem was not the length of the file names. None of them exceeded 32 characters. I reformatted the memory card and all is well.
Thank you for your help.
I recently got a 32 GB memory card to use with the CAB M+. It came formatted with MS-DOS. When I tried to copy my IR library to the card I got an error message about file names exceeding 32 characters.
Is there another way to format the card so it will accept file names longer than 32...