>Hi Ed:
>
>I got a "Missing Operand" error message on the following line.
>
>

nFiles = ADIR(aBWFiles,SOURCEPATHNAME + SOURCEFILEMASK)

>
>
>>

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

This is the first possible problem; I refer to an array aBWFiles everywhere other than the local; changing "aBWFile" to "aBWFiles" might correct this.

>>

#DEFINE SOURCEPATHNAME = '.\BW\'  && this is the BW subfolder of the Current Working Directory

You might want to try changing this into an absolute path rather than a relative path - the BW subfolder might not reside beneath your current working folder

>>

#DEFINE SOURCEFILEMASK = 'PROCESS*.DAT'
>>cConCatString = ''
>>nFiles = ADIR(aBWFiles,SOURCEPATHNAME + SOURCEFILEMASK)
>>FOR i = 1 TO nFiles  && this avoids all copies if no files were found
>>   cConCatString = cConCatString + FILETOSTR(SOURCEPATHNAME + 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