Compare Documents
You can compare documents in the SolidWorks Workgroup PDM vault.
Windows 7 and Windows Vista users cannot
use the SolidWorks Utilities Compare feature to compare documents in a
Workgroup PDM vault.
To compare documents in the vault:
Do one of the following:
DrawCompare.
In SolidWorks, click Tools, Compare, DrawCompare.
SolidWorks
Utilities. SolidWorks Utilities must be added in to SolidWorks.
Click Compare Documents, Compare Features, or Compare
Geometry on the Utilities toolbar.
Click Browse
to locate the first document.
In the dialog box, click Workgroup
PDM Vault 
, select a file, then click Open.
Repeat steps 2 and 3 for the second document.
Continue with the comparison as usual.