VFP8 and VFP9 check record count in the header against # of records in the table and will report table corruption if it doesn't match. See SET TABLEVALIDATE command for more details.

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>I have a .dbf structure that is generated programmatically. It will open in VFP7, but VFP8/9 see it as corrupted. If I open it in 7 and append a blank, then it will open in 8/9.
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>If I open it in Excel and save as a dbf, then it willl open in 8/9
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>Is there a header structure difference that might cause this behavior?
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>Where might I find a byte-by-byte spec so that I could programmatically make a dbf that will also open in 8/9?
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>Thanks
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>Al Allison