Hello, Jimmy and welcome to Webmaster World. VisView is the application from EAI that supports team interaction on engineering drawings, correct? If so, have you tried the support on the EAI website [eai.com]?
Not being familiar with the particulars of the application makes me hesitate to take a guess. I assume that there must be a client plug-in or application of some kind involved in opening a VisView file and that you are developing a "private membership" website or intranet of some kind so you can assume everyone has the needed software.
Normally Windows needs a file extension to recognize which application to launch, and you've stated that the files you're working with are strings of numbers and hyphens, with no extension. But honestly, that's just a conjecture, and may not apply in this case.
Maybe a member here has worked with this application and can give you a more precise direction. We have a lot of members with very diverse knowledge. So I'm floating the thread to give your question some more attention.
