Changing file type API to open with Adobe Reader 9.2

Question

In windows XP, if I go to C:\Program Files\Adobe\Reader 9.0\Reader\plug_ins, it shows the API extension to be File Type AcroExch.plugin
This seems to be because Adobe Acrobat 5.0 is installed first on the PC, then Adobe Reader 9.2 is installed on the PC.
On a clean PC, if I install Adobe Reader 9.2, then the file type becomes API file.
How do I change the file type from AcroExch.plugin to API file?

Answer 1

I want to do this because I have a 3rd party plugin which will not work otherwise.
The 3rd party plugin is FileOpen Installer.
http://plugin.fileopen.com
If Adobe Reader 9.2 is installed on the PC first, then the folder c:\program files\adobe\reader 9.0\reader\plug_ins looks like the attached JPG Adobe Reader 9 Plugin working.jpg
FileOpen Plugin works with the above situation.
Note that it is a 3rd party supplier which sends files which require the 3rd party Plugin FileOpen and a test document is here
http://fileopen.bl.uk:8008/FileOpenFreeLink-1.0/entryPage.do;jsessionid=FADC8178CCD0236480 199338A79483E7
If Adobe Acrobat 5.0 is installed on the PC first and the Adobe Reader 9.2, then the folder c:\program files\adobe\reader 9.0\reader\plug_ins looks like the attached Adobe Reader 9 Plugin Problem.jpg and the test file sent by the British Library above will not open.
You get the following when you try to open the British Library test file (see British Library2.jpg)
FileOpen is installed as a 3rd Party Plugin in Adobe Reader 9.2 and I can see this under Help About 3rd Party Plugins FileOpen Installer.
(Note Adobe Acrobat 5 runs via a network install and is not installed onto the workstation so I can't remove it via Add/Remove Programs).
So I am guessing the problem is to do with the API file type being different when Adobe Acrobat 5 is installed first?
Thanks,
Paul