We upgraded our Enterprise PDM and SolidWorks to SP4 recently. Overall things went pretty smoothly.
One unfortunate thing that happened to all users who do not have SolidWorks: File types slddrw, sldasm, sldprt are no longer associated to eDrawings by default. The preview pane in Enterprise PDM works fine, but when they attempt to open the files, the program to view them does not launch!
To fix the problem it is necessary to open Windows Explorer and pick Tools/Folder Options/File Types... then create new file extensions for the three types, then navigate to C:\Program Files\Common Files\eDrawings2009 and select eDrawings to associate with each file type.
It seems that eDrawings lost the associations to these files when the old version was removed and the new version installed. This has been a pain and I wondered if anyone else has experienced this problem.