QuickView Plus is a file viewer that supports over 225 Windows, Mac and other file formats. Unfortunately, the version that ran on Unix, QuickView Plus for Unix, is apparently obsolete. The current version, Quick View Plus 8, runs only on Windows. The Unix version was last sold by Avantstar, Inc., and before that by Stellent, Inc., but there is no longer any mention of a Unix version on either web site.
I see that Stellent has another product, Outside In, that appears to do the same thing that Quick View Plus for Unix used to and runs on a variety of Unix platforms. I know nothing about it other than the little I read on the Stellent web site.