selected file appears to be corrupted

Hi everybody,
I had a user contact me this morning with this message: The selected file appears to be corrupted. You may continue to open this file and Pro/ENGINEER will attempt to retrieve it. Please abort and save all work before continuing.
I've never seen this in almost 20 years of using Pro/E. We are using WF4.
Any ideas? I opened the assembly and had no issues. Is the user's cache corrupted in PDMLink (10.0)?
thanks for any input.
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