When an exclude entry is created for a package, such as "D:", it is changed to "[SYSTEMDRIVE]\D:" after a COMPILE action when using Workspace Virtual Composer (WVC). This behavior is not seen when using the SVS Admin Tool, or by simply importing the package into WVC.
This issue will be fixed in a future release of Workspace Virtual Composer.
The recommended method for exclusions is to use the "Layer Exclude Finder" tool, as it checks the "_SWV_LAYER_1\HU\USER_TEMPLATE\Software\Classes" location to determine what excludes are there, so that it can then add them as excludes to the layer itself. The tool can be downloaded here: