It sounds as though the file has been corrupted.

You should never save Office files to memory sticks (or open them from there) as they are a regular source of data loss. If the available space is too small the file is corrupted or lost completely. Similarly if there is an interruption to the data or you remove the flash media before the file has been completely written, you will get file corruption. Always work from the hard drive and copy to and from flash media.

__________________
Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com