If the replaced text is different in size than the find text, do you think it will work fine.
Ex. Find String = "AD00" & Replace String = "RR889"

>>Try this (modified from Cetin code) for testing if the replaced string is being split during FREADs:
>>
>>
>>#DEFINE MAXBUFFER 65536
>>lhIn = FOPEN(lcFileIn)
>>lhOut = FCREATE(lcFileOut)
>>DO WHILE NOT FEOF(m.lhIn )
>> lcBuffer = FREAD(m.lhIn, MAXBUFFER)
>> DO CASE
>> CASE RIGHT(lcBuffer,3) = 'AD0'
>> FSEEK(m.lhIn, -3, 1)
>> lcBuffer = LEFT(lcBuffer,LEN(lcBuffer)-3)
>> CASE RIGHT(lcBuffer,2) = 'AD'
>> FSEEK(m.lhIn, -2, 1)
>> lcBuffer = LEFT(lcBuffer,LEN(lcBuffer)-2)
>> CASE RIGHT(lcBuffer,1) = 'A'
>> FSEEK(m.lhIn, -1, 1)
>> lcBuffer = LEFT(lcBuffer,LEN(lcBuffer)-1)
>> ENDCASE
>> FWRITE(m.lhOut,STRTRAN(lcBuffer,'AD00','BR77'),MAXBUFFER)
>>ENDDO
>>FCLOSE(m.lhIn)
>>FCLOSE(m.lhOut)
>
>I didn't understand what Fabio meant either. Your code is nicer and faster than mine:) It processed a 138+Mb file in 14 secs on my box (Athlon 2500+,512Mb onboard 64Mbshared mem VGA).
>Cetin