> Having user programs intrude/affect the OS isn't
> a big deal on single user "personal" computers like 
> most Mac & Windows systems but when it happens in
> a multi-user environment (Linux/Unix/VMS/whatever)
> it should be seen as a "Bad Thing".

Well, obviously, I disagree.  I think it would be a Peachy Thing to be
able to add new kind of files, as a regular user.

-Lex