Thank you for checking!
As your help indicated that the script was correct, I've finally figured out the problem: I've searched in the wrong location. It shouldn't have been C:\Documents and Settings\ddoord\Application Data\QlikTech\QlikView but
C:\Documents and Settings\ddoord\Local Settings\Application Data\QlikTech\QlikView\Buffers. As it is a hidden directory, a windows search delivered no results with the standard search settings on!
hmmm have you checked the settings:
this is from the inside qlikvie help:
QVD buffers will normally be removed when no longer referenced anywhere throughout a complete script execution in the document that created it or when the document that created it no longer exists. This housekeeping can be turned off by checking the options Keep Unreferenced QVD Buffers in Document Properties: General (first requirement) and Keep Orphaned QVD Buffers in User Preferences: General (second requirement) property pages respectively, though the procedure cannot be generally recommended.