Jarnys' howto is great, it will most likely allow you to play.
Google-ing the error message brings up a lot of people who have similar issues with their win7 64 running 32bit applications. I checked a lot of them: About half are unresolved, the other half either has some application-specific workarounds or got resolved via an application patch. The error message is a windows error dialog.
In the interest of ryzom, devs may want to find out how the other companies fixed that issue. It might be related to some previously installed 16bit software interfering with the installer. Or a 64bit tool invoked in a 32bit context.
Since the installer seems to be some rather simple unpacker the easiest way will be replacing it with something newer.
Edit: some readups:
http://answers.microsoft.com/en-us/windows/forum/windows_7-window s_programs/installing-32-bit-games-on-64-bit-windows-7/c32e4dc0-a 239-445f-89aa-d31e1ba9523e
(check Linney's posts, he is MVP and don't try anything related to Virtual PC / Windows XP Mode)
http://answers.microsoft.com/en-us/windows/forum/windows_other-ga ming/running-game-this-version-of-the-file-is-not/1e20c9c8-6929-4 e31-9eac-2b8221b127b8
(Ajay K is MS support rep., try her (his?) suggestion on http://support.microsoft.com/kb/929135)
Google-ing the error message brings up a lot of people who have similar issues with their win7 64 running 32bit applications. I checked a lot of them: About half are unresolved, the other half either has some application-specific workarounds or got resolved via an application patch. The error message is a windows error dialog.
In the interest of ryzom, devs may want to find out how the other companies fixed that issue. It might be related to some previously installed 16bit software interfering with the installer. Or a 64bit tool invoked in a 32bit context.
Since the installer seems to be some rather simple unpacker the easiest way will be replacing it with something newer.
Edit: some readups:
http://answers.microsoft.com/en-us/windows/forum/windows_7-window s_programs/installing-32-bit-games-on-64-bit-windows-7/c32e4dc0-a 239-445f-89aa-d31e1ba9523e
(check Linney's posts, he is MVP and don't try anything related to Virtual PC / Windows XP Mode)
http://answers.microsoft.com/en-us/windows/forum/windows_other-ga ming/running-game-this-version-of-the-file-is-not/1e20c9c8-6929-4 e31-9eac-2b8221b127b8
(Ajay K is MS support rep., try her (his?) suggestion on http://support.microsoft.com/kb/929135)