Hi,
Thanks Sergey, I have been trying to figure this one out for the last couple of days.

>It's VFP9SP1 bug with FSEEK() on unbuffered file. The workaround is to open file in the buffered mode, as you already found.
>
>>
>>I have a old application that use to work fine until I (think) updated VFP9 SP1.
>>
>>I need to go to the end of file (TXT) and then, skip -410 positions, and then write something new.
>>
>>The code that always (until now) worked fine is below:
>>

>>nFile = FOpen("FILE.TXT",12)
>>FSeek(nFile,-410,2)
>>FPuts(nFile, "MY NEW TEXT HERE")
>>

>>
>>Now, maybe after update my VFP9 to SP1, I have to do that:
>>

>>nFile = FOpen("FILE.TXT",12)
>>FSeek(nFile,0,2)
>>FSeek(nFile,-410,1)
>>FPuts(nFile, "MY NEW TEXT HERE")
>>

>>
>>Strange.... :-)
>>
>>Any comments.