I think you should focus on fixing the problem, and not the symptom. And the symptom is occasional write error, most likely a file lock due to slow hardware. So, IOW the program itself works, so no reason to change it.

Put the StrToFile() in a loop, with a little delay between each file write attempt, and exit the loop once the file write is successful. If you have VFP9 it's very easy since you can include a Try-Catch-Endtry in the loop.

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>Sorry for a lack of information. Yes, I need to write it back in the same file. File is a small, couple of kb.
>There is a procedure: I receive a file from a service (cyrilyc and latinic letters) which I should transform all to latinic. Some of lines in a file is longest than 254bytes. After transformation I search for a specific strings, remember variables and write it down to database. After that I delete file.
>
>
>If you give a better description of what you really want to achieve, we can help you better.
>
>You don't only want to search a file, you also want to write it back, which is new information. And when you write it back, is it to the same file name, or a new?
>
>Also, please tell us roughly how big the files are.
>
>The more information you give, the better.
>
>>On slow computers when I issue FILETOSTR(), then some proccesing and then STRTOFILE() back, sometimes error file access denied occurs. I don't want to slow down program while proccesing because of few users :-(. So, I'm looking for a possible different solution.
>>
>>May I ask what's wrong with using FileToStr()?
>>
>>>Line lenght can be more than 254 bytes and before the time of proccesing I don't know lenght of a specific line.
>>>
>>>You can use FGET to read text file line by line and compare
>>>
>>>>Any ideas how to find string between two unique strings in TXT file without using FILETOSTR command?
>>>>For example I need to find string
>>>>
>>>>aa
>>>>bb
>>>>cc
>>>>
>>>>in TXT file
>>>>
>>>>1111
>>>>2222
>>>>3333
>>>>first string:aa
>>>>bb
>>>>cc
>>>>second string:fsdfsdfs
>>>>444
>>>>555