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I initially installed it and then uninstalled it trying to resolve why it gave me the "This program requires steam: error" which many many people were reporting as problems. I had to fix the FSX.exe to remove manifest entries added by Dovetail that put the fsx.exe in permanent administrator mode. When trying to run steam in admin mode sill would not load up the sim. So I had to uninstall and reinstall via steam and change the fsx.exe file. Hopefully all is now good and no problems with other addons that use the AppPath for install.

I hacked the registry info into the appropriate FSX:SE key location. All that was present was just the key Flight Simulator - Steam Edition in HKEY_CURRENT_USER\Software\Microsoft\Microsoft Games\ so I added the AppPath key myself and set it to C:\Steam\SteamApps\common\FSX When I ran the installer as administrator again, this what I the log showed: Installer for FSUIPC4.DLL version 4.939n Looking in registry for FSX install path: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\10.0 Parameter"SetupPath" ... >>> OK! FOUND FSX! <<< ... SetupPath=C:\Microsoft Flight Simulator X\ Looking in registry for FSX-SE install path: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator - Steam Edition\10.0 Parameter"SetupPath" Not there, so looking in: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator - Steam Edition\10.0 Parameter"AppPath" ... >>> OK! FOUND FSX-SE! <<< ... AppPath=C:\Steam\SteamApps\common\FSX Looking in registry for Prepar3D v1 install path: HKEY_LOCAL_MACHINE\SOFTWARE\LockheedMartin\Prepar3D Parameter"SetupPath" Not there, so looking in: HKEY_CURRENT_USER\SOFTWARE\LockheedMartin\Prepar3D Parameter"AppPath" ... NOT found! ... Looking in registry for Prepar3D v2 install path: HKEY_LOCAL_MACHINE\SOFTWARE\Lockheed Martin\Prepar3D v2 Parameter"SetupPath" Not there, so looking in: HKEY_CURRENT_USER\SOFTWARE\Lockheed Martin\Prepar3D v2 Parameter"AppPath" ... NOT found! ... Not certain if what I did was correct but it appears so based upon the FSX registry entry. As well, once I started up FSX:SE, I was prompted to load the FSUIPC4.DLL module and I verified it is registered.

I used the latest installer from Install_FSUIPC4939n.zip and ran as an Administrator that produced the following log entries: Looking in registry for FSX install path: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\10.0 Parameter"SetupPath" ... >>> OK! FOUND FSX! <<< ... SetupPath=C:\Microsoft Flight Simulator X\ Looking in registry for FSX-SE install path: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator - Steam Edition\10.0 Parameter"SetupPath" Not there, so looking in: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator - Steam Edition\10.0 Parameter"AppPath" ... NOT found! ... Although FSUIPC has not found my FSX:SE installation, it is most certainly there. I installed Steam to C:\Steam so it does not run under Program Files(x86) which is a Windows protected area and nothing should install there. MY FSX installation is at C:\Microsoft Flight Simulator X I installed both FSX and FSX:SE using the supplied installers; Microsoft FSX installer and installed FSX:SE through Seam. FSX:SE does run though I had to modify the fsx.exe manifest to remove hard dependencies added by DoveTail for Administrator rights. I have FSUIPC latest installed into FSX. It is a registered copy as well.

So Steam is installed to C:\Steam and, I believe, as a result the FSUIPC installer will only find FSX which is installed to C:\Microsoft Flight Simulator X. Why is FSX:SE not discovered? I looked where the installer does in the registry but not listed. Can I manually install FSUIPC into FSX:SE?