How to change the key combination of a program

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I've a program (*.exe) which gets started just after the Windows logon
and which functionality I use. This program unfortunately uses the key
combination 'Ctrl + F5' to display an info message box. That's very
bad because I have another program where I really need the key
combination 'Ctrl + F5' and unfortunately the first program "wins" so
that if I use 'Ctrl + F5' the info message box appears.
Because the programmer of the first program doesn't offer any
possibility to change the key combination I'm trying to find a way to
change it by myself.

Here's my approach:
Somewhere in the program (*.exe) there must be some commands which
tell Windows what to do if someone uses the key combination 'Ctrl +
F5'. I'd like to edit that commands directly in the *.exe file (with
debug, hexedit, ...) so that not the key combination 'Ctrl + F5' is
used but e.g. 'Ctrl + F12'.
I think that should work but the problem is how to find the commands
which define this key combination.
In DOS it was the interrupt INT 9 (keyboard interrupt) so that I could
search for INT 9. However, I've no idea for what I have to search in
Windows XP.

Any help or idea how I could change the key comination 'Ctrl + F5' to
e.g. 'Ctrl + F12' is very appreciated.

Stefan
.

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