>Days ago I realized that some applications of mine still have old foxtool.fll from 2001
That's the VFP 7 version.
>What types of problem can such and old file cause ?
I wouldn't expect any. There haven't been many changes to the VFP 8 and VFP 9 version of FoxTools. The latest version is from 2004, so not that much newer.
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Christof