>>>A table with a large fpt is copied (copy/xcopy,whatever). If I open (USE SHARED) that table during that copying, I get the error message 'Memo file is missing or invalid'. After the copying the error is gone. The table is perfectly okay.
>>>
>>>Is this a known quirck? Is this acceptable behavior?
>>
>>Yes, this is known behavior. However, are you sure the file is OK?
>
>The table is (and stays) okay in every aspect.
>
>It's an 'interesting' quirck. I'm even inclined to call it a bug. I wonder how this can be tackled, as the implication is that opening tables can and will fail when a user is copying the files.

I think we got some tables corrupted when we have them opened and tried to copy them at the same time. At least we had to re-index the database.