>>Hi Agnes
>>
>>I have not used this function very much myself, but if you get the error you get, I can only think of two possible causes. Either you have misspelled STREXTRACT or you use an older version of VFP. I think STREXTRACT was introdueced in VFP7, or VFP8, but I am not sure.
>>
>>>Hi,
>>> I would like to ask how to use the function STREXTRACT in Foxpro.
>>> While I use it, it alert that File "STREXTRACT.prg" is not found.
>>>
>>>Thanks a lot,
>>>Agnes
>
>STREXTRACT function does not exist in VFP 6 SP5. I get the same error looking for STREXTRACT.prg and it is not listed in HELP. It must have been introduced in VFP 7 or later.

It was 7.0.