I was suggesting you abandon your entire program, and run the following instead, either as a bat file, or directly from the command prompt:

msaccess.exe  s:\mdbtest.mdb /x RunTest
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In case you want to pursue the perl route, please add an error message display to your code. This will make it easier to identify the problem:

# Open Access File
$oDatabase = $oAccess->DBEngine->OpenDatabase($filename) 
  or die qq{Couldn't open database $filename!\n} . 
     Win32::OLE->LastError();
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