That .LUP file extension appears to refer to "OzWin CompuServe E-mail/Forum Access Library Update". No idea what that is, and Google doesn't appear to listed anything different from that. Here's an example of a Google site listed;
So, what is this file, where did it come from, and why are you trying to open it. Not intruding, just seeking more information that may help.
When you try to add it. Add what, the .LUP file?
If you are attempting to open that file in HexEdit, then it would seem you need to install HexEdit first. You may then be able to associate that file type with the HexEdit application through "Open with".
I'm not sure about removing "Open with" entries. I believe this may be something to do with ShellExtension, and the Context Menus, so you would need some thing like ShellExView to view and manage those.
Since this is a company machine, I am not sure any 'registry hacks' can be offered. Your IT Admin may be able to help there.
I have a file with a non-windows extension (.LUP to be precise) which doesn't have an associated Windows-specific program. I have got a program called HexEdit (simple Hex and ASCII editor) which I didn't install (since it came from a colleague in a folder with just the .exe and files needed to run the program) and so Windows didn't populate the "Open With" programs menu with the program.
When I try to add it (by Browsing for the .exe in the "Open With" menu) I click on the .exe, and click "OK" yet it doesn't get added to the list.
I then tried to add the shortcut to the program to this list, but then I get the error message "[This program] is not a valid Win32 application".
I've added the shortcut to the Programs folder in the Start Menu, yet still to no avail.
So my 2 questions are:
1) How can I get rid of the shortcut which has now appeared in the "Open With" programs menu?
and 2) Is there a way to get this .exe file to appear in this list (possibly by some Registry hack) without installing any 3rd-party programs (since IT at the company I work at gets really shirty about that sort of thing)?
Thanks in advance,
(P.S.) I'm running Windows XP Pro, SP2.