>Real-time AV scanning hooks deep into the file system and can intercept/delay read (and/or write) requests while it does its scanning. It's possible that VFP may occasionally write a cursor to disk; delays due to scanning may get interpreted as "file does not exist" or "alias not found".
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>Disabling real-time scanning for just your temp file folder may be enough to test this theory.
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>There may also be other processes that hook into the file system e.g. so-called "real-time" backup/mirroring utilities.
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>READWRITE does not necessarily force a file to be written to disk, NOFILTER does. It might be interesting to experiment with adding NOFILTER to your query.
>

Al,

I believe the last statement is incorrect. Readwrite does the same as NOFILTER.