>>>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.
>
>PMFJI, but is it possible to install this library on a 64 bit machine?

Iv VFP9 runs on the machine, the library will also work.