>>First of all, add CHR(13)+CHR(10), e.g.
>>#define CRLF chr(13)+chr(10)
>> cConCatString = m.cConCatString + CRLF+FILETOSTR("c:\BW\" + aBWFiles[i,1])
>>
>>Secondly, the code looks fine and should work, unless you have huge files. >Try to examine the files first...
>
>Hi Nadya:
>
>I got it to work. The code was looking for .dat files while the filed to be copied is an SDF type. Once I change the file name to read "Process*.*", the code found the files and copied them.
>
>The only remaining problem is that the file being copied to should also be an SDF type file. How do I accomplish this? Thank you.

What's wrong with the current approach? Did you examine the content of the new file? What's wrong with it?