ExecCmd ("cmd.exe /c Copy ...)

Need help with "ExecCmd()".  What is its purpose and can anyone decipher what might be happening in this line?  I guess the question marks are legal syntax since I am not getting any errors from the shell.  I am trying to figure out someone elses code.

ExecCmd ("cmd.exe /c Copy " & l_Path & "Tensil.txt + " & l_Path & rsPos!SapRoll & "???M.rep + " & l_Path & rsPos!SapRoll & "???T.rep " & l_Path & "Tensil.txt")

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I guess
l_Path is a variable the holds a directory path (eg "C:\Mydata\")

rsPos is a recordset of some sort
SapRoll is a field in rsPos that holds some further path/file info (eg "MyFile")
 the ??? are  Wild card characters  

so the code is copying files

and any  files that begin with value of rsPos!SapRoll with 3 characters followed by either T.rep or M.rep
from I_Path
to a single file - Tensil.txt - in the same directory


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