The sample script under "CAL Commands DDE Syntax" in the ChemFinder Help does not seem to work properly. Specifically, the DOS ERASE C:\DATA.TMP line does not appear to work.
Change the script to:
IF EXIST DATA.TMP DEL DATA.TMP
EXEC "c:\program files\microsoft office\office\excel.exe"
DDE Excel System [OPEN("C:\DATA.TMP")]
DDE Excel System [COLUMN.WIDTH(1,"C1:C4",,3,1)]