Hi Nadya:

I tried what you suggest. Did not get the error message, but nothing got copied either to the MyConCatfile. The files that need to be copied are sdf and MyConCatFile also should be an sdf file. Here is the current code,with minor variations from what Ed suggested to me.

LOCAL cConCatString, aBWFiles[1,5], nFiles, i

cConCatString = ''
nFiles = adir(aBWFiles, "c:\BW\Process*.dat")

FOR i = 1 TO nFiles  && this avoids all copies if no files were found
      cConCatString = cConCatString + FILETOSTR("c:\BW\" + aBWFiles[i,1])
ENDFOR
=STRTOFILE(cConCatString,'MyConCatFile.DAT',.F.)  && .T. would append to any existing MyConCatFile.DAT found
RELEASE cConCatString  && releases the large string memory allocation

Problem now is that nothing is being copied. Second the MyConCatFile appears as a text file and not an sdf type.

Thanks