We can't have the custom properties in the file explorer (Solidworks 2011) with Windows 7 64bits
Some users have Windows XP and the properties are showed at the screen.
You could be simple if we could add a custom property to the Windows explorer but
i can just add the column Description.
See the differences between the file explorer
Windows 7 - 64 bits
Windows XP
Christian
What I do is, select File, Properties, then the Summary Information window appears. Select Summary tab, type the description in the Title section. Now in the Windows Explorer, RMB on the bar with column names, select (check on) Title from the list. Now when you look at the Windows Explorer the description will appear. I have the Title column next to the Name column. Hope this helps.