I know. I quoted the pdf to their man (Nick), who told me about the internal memory checking, reading (call it what you like) the files from the usb prior to running the program.
It suspect it is the manual that is wrong. If anyone knows different and can tell me how to bypass internal memory, I'd love to know.
The pendant is made in China, MCP are resellers AFAIK. It sounded to me like I was the first person to ask how to run a large file direct from usb.
I am going to e-mail them to clarify, as well as contacting the Chinese manufacturer to find out more.