Novell ZENworks Desktop Management 6.5 - ZDM6.5 Application Launcher (NAL)
Novell ZENworks Desktop Management 7 - ZDM7 Application Launcher (NAL)
If an application is marked "force cache", then the files needed to install are copied to NALCACHE: if the application is unassociated and uninstalled, these files should be deleted. Sometimes these install files are left behind, even though the other files for the application are deleted.
For ZDM7: Fixed in ZENworks 7 with SP1 Desktop Management, available at https://download.novell.com
This problem only arises if the source files are marked read-only: the attribute is copied with the files, and a normal delete cannot remove them.