in reply to How do I tell perl to excute a windows from a specif folder

You need to quote the program name because of the space in its path; Try:

@out=`"C:\\Program Files\\Tivoli\\TSM\\server\\tsmdiag\\dsmadmc" -id=$
+ID -pass=$PASS "checkin libvol i500 search=bulk checklabel=barcode st
+atus=$arg"`;
#.....^...............................^........................^

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