If you modify C:\MentorGraphics\VeSys\config\vesysprops.xml (using Notepad or any other text editor) you will see a line that defines the images location... change this to point to your central file server, do this on all three machines and you will have yourself a common Images Repository. Let me know how you get on,
I have my machine set-up for an image folder in the server and the rest of the team will follow suit. Tested it on mine and it works great! Thanks Nuri.