>Thank you . I divided the txt file into 1 K partitions and now works fine. Can I SET MEMOWIDTH TO 1023 ? (working with VFP 3.0) . I think that regular values are between 8 and 256.

I think you can set MemoWidth to 1023 in VFP 3.0.

By dividing the file into 1K partitions, remember that you might be dividing the file right through a character string for which you are searching (and thus will not find it). Some of your own buffering might be necessary unless you are certain that this won't happen, given the structure of information in your input file.