[FSUIPC installer is unable to edit the DLL.XML file - it tries to locate FSX-SE exclusively, only FSX exists]

Not that I'm aware of at least. However, I've given it some thought, during the first run of the FSUIPC installer I gave permission to fix the leftover registry entry of the previous FSX:SE installation (which was installed on a different drive, so it recognized that the path was not correct). Then of course I ran into this issue. During the initial troubleshooting I did fire up FSX:SE for a brief moment. Perhaps the combination of the removal of the old registry entry and then starting FSX:SE somehow fixed the registry? That's really all I can think of, although I ran the FSUIPC installer several times in the mean time as well, so if this is indeed what caused it to work then I would imagine it should have worked sooner than it did... oh well

Thanks for the prompt support Pete!

[FSUIPC installer is unable to edit the DLL.XML file - it tries to locate FSX-SE exclusively, only FSX exists]

Something quite strange just happened - I followed your instruction, merely creating a copy of FSX.CFG and renaming it to FSX_SE.CFG. Re-ran the installer, and it worked! But for a very different reason.

Here's the install log, notice how this time it did find the "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\10.0" registry key, causing it to also look for FSX rather than FSX_SE only (I did nothing else than what I mentioned above):

Quote

Installer for FSUIPC4.DLL version 4.975a

Looking in registry for FSX install path:
     HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\10.0
     Parameter"SetupPath"
Not there, so looking in:
     HKEY_CURRENT_USER\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\10.0
     Parameter"AppPath"
... >>>  OK! FOUND FSX!  <<< ...
     AppPath=F:\Steam\steamapps\common\FSX\

Looking in registry for FSX-SE install path:
     HKEY_LOCAL_MACHINE\SOFTWARE\DovetailGames\FSX
     Parameter"Install_Path"
... >>>  OK! FOUND FSX-SE!  <<< ...
     SetupPath=F:\Steam\steamapps\common\FSX

************ BUT this is the same path as for FSX! Will only install for FSX-SE ************

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! ...

Looking in registry for Prepar3D v3 install path:
     HKEY_LOCAL_MACHINE\SOFTWARE\Lockheed Martin\Prepar3D v3
     Parameter"SetupPath"
Not there, so looking in:
     HKEY_CURRENT_USER\SOFTWARE\Lockheed Martin\Prepar3D v3
     Parameter"AppPath"
... NOT found! ...
===========================================================

INSTALLATION FOR FSX-SE:
SetupPath="F:\Steam\steamapps\common\FSX\"
Checking version of the FSX-SE EXE:
... Version 10.0.62615.0  (Need at least 10.0.62607.0)
Checking compatibility with installed SimConnect:
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\Fusion\*SimConnect*"
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\*SimConnect*10.0.60905.0*"
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\Fusion\*SimConnect*"
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\*SimConnect*10.0.62615.0*"
    Found the path, now trying "C:\WINDOWS\WinSxS\x86_microsoft.flightsimulator.simconnect_1ed9da73c880e429_10.0.62615.0_none_69960aa860d87067\SimConnect.dll"
Found SimConnect build 10.0.62615.0
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\Fusion\*SimConnect*"
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\*SimConnect*10.0.61242.0*"
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\Fusion\*SimConnect*"
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\*SimConnect*10.0.61259.0*"
    Found the path, now trying "C:\WINDOWS\WinSxS\x86_microsoft.flightsimulator.simconnect_67c7c14424d61b5b_10.0.61259.0_none_55f5ecdc14f60568\SimConnect.dll"
Found SimConnect build 10.0.61259.0
Checking if there's already a version of FSUIPC4 installed in:
       F:\Steam\steamapps\common\FSX\Modules\FSUIPC4.DLL
... Version 4.975a found.
FSX-SE Modules folder already exists.
Okay -- installed FSUIPC4 into "F:\Steam\steamapps\common\FSX\Modules\FSUIPC4.DLL"
Looking for the current user's Application Data path: 
... found as "C:\Users\Thomas\AppData\Roaming"
Now finding \Microsoft\FSX-SE\FSX_SE.CFG for all users, including this one
Looking in "C:\Users\All Users\AppData\Roaming"
 ... No FSX_SE.CFG there
Looking in "C:\Users\Default\AppData\Roaming"
 ... No FSX_SE.CFG there
Looking in "C:\Users\Default User\AppData\Roaming"
 ... No FSX_SE.CFG there
Looking in "C:\Users\Public\AppData\Roaming"
 ... No FSX_SE.CFG there
Looking in "C:\Users\RDV GRAPHICS SERVICE\AppData\Roaming"
 ... No FSX_SE.CFG there
Looking in "C:\Users\Thomas\AppData\Roaming"
 ... No FSX_SE.CFG there
Looking for the current user's Application Data path: 
... found as "C:\Users\Thomas\AppData\Roaming"
Now finding \Microsoft\FSX-SE\FSX.CFG for all users, including this one
Looking in "C:\Users\All Users\AppData\Roaming"
 ... No FSX.CFG there
Looking in "C:\Users\Default\AppData\Roaming"
 ... No FSX.CFG there
Looking in "C:\Users\Default User\AppData\Roaming"
 ... No FSX.CFG there
Looking in "C:\Users\Public\AppData\Roaming"
 ... No FSX.CFG there
Looking in "C:\Users\RDV GRAPHICS SERVICE\AppData\Roaming"
 ... No FSX.CFG there
Looking in "C:\Users\Thomas\AppData\Roaming"
 ... No FSX.CFG there
Looking for the current user's Application Data path: 
... found as "C:\Users\Thomas\AppData\Roaming"
Now finding \Microsoft\FSX\FSX.CFG for all users, including this one
Looking in "C:\Users\All Users\AppData\Roaming"
 ... No FSX.CFG there
Looking in "C:\Users\Default\AppData\Roaming"
 ... No FSX.CFG there
Looking in "C:\Users\Default User\AppData\Roaming"
 ... No FSX.CFG there
Looking in "C:\Users\Public\AppData\Roaming"
 ... No FSX.CFG there
Looking in "C:\Users\RDV GRAPHICS SERVICE\AppData\Roaming"
 ... No FSX.CFG there
Looking in "C:\Users\Thomas\AppData\Roaming"
Found FSX.CFG in "C:\Users\Thomas\AppData\Roaming\Microsoft\FSX\FSX.CFG"
Now checking DLL.XML ...
... No previous DLL.XML found, creating new one (for FSUIPC4 only).
Now checking for a SimConnect.XML file ...
... No SimConnect.XML file found. This is okay.
"Modules\FSUIPC Documents" folder already exists.
Now installing additional files into the "Modules\FSUIPC Documents" folder:
   Installed "FSUIPC4 User Guide.pdf" okay
   Installed "FSUIPC4 for Advanced Users.pdf" okay
   Installed "FSUIPC4 History.pdf" okay
   Installed "The 2016 List of FSX and P3D Controls.pdf" okay
   Installed "FSUIPC Lua Library.pdf" okay
   Installed "FSUIPC Lua Plug-Ins.pdf" okay
   Installed "Lua License.pdf" okay
   Installed "Lua Plugins for VRInsight Devices.pdf" okay
   Installed "LuaFileSystem.pdf" okay
   Installed "Example LUA plugins.zip" okay
   Installed "ASN WX Radar facilities in FSUIPC4.pdf" okay
   Installed "Offset Mapping for PMDG 737NGX.pdf" okay
   Installed "Offset Mapping for PMDG 777X.pdf" okay
   Installed "Offset Mapping for PMDG 747QOTSII.pdf" okay
   Installed "FSUIPC4 Offsets Status.pdf" okay
   Installed "Profiles in Separate Files.pdf" okay
   Installed "FSUIPC4_Loader.dll" okay
===========================================================

All installer tasks completed.
Registration dialog exit: selected  FSUIPC CHECK
Checking FSUIPC registration ...
Registration check for FSUIPC4 was successful! (result code 00)

*************** End of Install Log ***************
 

Do you have any idea what might have happened here? Did I hit some kind of edge case?

[FSUIPC installer is unable to edit the DLL.XML file - it tries to locate FSX-SE exclusively, only FSX exists]

Yes, I have run FSX:SE several times since the reinstallation (the first time being right after Steam finished installing it). The actual fsx.CFG is located in "C:\Users\Thomas\AppData\Roaming\Microsoft\FSX", although there's no trace of a "DLL.XML" in there. I vaguely remember it being there in my previous installation, not sure if that's unusual, is FSX:SE supposed to generate that file in its absence by default?

The FSUIPC installer is running as administrator.

[FSUIPC installer is unable to edit the DLL.XML file - it tries to locate FSX-SE exclusively, only FSX exists]

Hi Pete,

I recently uninstalled FSX:SE and removed all left over data in the AppData and ProgramData folders in order to start over with a fresh new installation of FSX:SE (I did not clean the registry, which I now regret). Unfortunately I have run into an issue with the FSUIPC installer I've never experienced before. Here's a full copy of the install log:

Quote

Installer for FSUIPC4.DLL version 4.975a

Looking in registry for FSX install path:
     HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\10.0
     Parameter"SetupPath"
Not there, so looking in:
     HKEY_CURRENT_USER\SOFTWARE\Microsoft\Microsoft Games\Flight Simulator\10.0
     Parameter"AppPath"
... NOT found! ...

Looking in registry for FSX-SE install path:
     HKEY_LOCAL_MACHINE\SOFTWARE\DovetailGames\FSX
     Parameter"Install_Path"
... >>>  OK! FOUND FSX-SE!  <<< ...
     SetupPath=F:\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! ...

Looking in registry for Prepar3D v3 install path:
     HKEY_LOCAL_MACHINE\SOFTWARE\Lockheed Martin\Prepar3D v3
     Parameter"SetupPath"
Not there, so looking in:
     HKEY_CURRENT_USER\SOFTWARE\Lockheed Martin\Prepar3D v3
     Parameter"AppPath"
... NOT found! ...
===========================================================

INSTALLATION FOR FSX-SE:
SetupPath="F:\Steam\steamapps\common\FSX\"
Checking version of the FSX-SE EXE:
... Version 10.0.62615.0  (Need at least 10.0.62607.0)
Checking compatibility with installed SimConnect:
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\Fusion\*SimConnect*"
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\*SimConnect*10.0.60905.0*"
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\Fusion\*SimConnect*"
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\*SimConnect*10.0.62615.0*"
    Found the path, now trying "C:\WINDOWS\WinSxS\x86_microsoft.flightsimulator.simconnect_1ed9da73c880e429_10.0.62615.0_none_69960aa860d87067\SimConnect.dll"
Found SimConnect build 10.0.62615.0
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\Fusion\*SimConnect*"
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\*SimConnect*10.0.61242.0*"
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\Fusion\*SimConnect*"
    Looking for SimConnect.dll with "C:\WINDOWS\WinSxS\*SimConnect*10.0.61259.0*"
    Found the path, now trying "C:\WINDOWS\WinSxS\x86_microsoft.flightsimulator.simconnect_67c7c14424d61b5b_10.0.61259.0_none_55f5ecdc14f60568\SimConnect.dll"
Found SimConnect build 10.0.61259.0
Checking if there's already a version of FSUIPC4 installed in:
       F:\Steam\steamapps\common\FSX\Modules\FSUIPC4.DLL
... Version 4.975a found.
FSX-SE Modules folder already exists.
Okay -- installed FSUIPC4 into "F:\Steam\steamapps\common\FSX\Modules\FSUIPC4.DLL"
Looking for the current user's Application Data path: 
... found as "C:\Users\Thomas\AppData\Roaming"
Now finding \Microsoft\FSX-SE\FSX_SE.CFG for all users, including this one
Looking in "C:\Users\All Users\AppData\Roaming"
 ... No FSX_SE.CFG there
Looking in "C:\Users\Default\AppData\Roaming"
 ... No FSX_SE.CFG there
Looking in "C:\Users\Default User\AppData\Roaming"
 ... No FSX_SE.CFG there
Looking in "C:\Users\Public\AppData\Roaming"
 ... No FSX_SE.CFG there
Looking in "C:\Users\RDV GRAPHICS SERVICE\AppData\Roaming"
 ... No FSX_SE.CFG there
Looking in "C:\Users\Thomas\AppData\Roaming"
 ... No FSX_SE.CFG there
Cannot edit the DLL.XML file to activate FSUIPC.
"Modules\FSUIPC Documents" folder already exists.
Now installing additional files into the "Modules\FSUIPC Documents" folder:
   Installed "FSUIPC4 User Guide.pdf" okay
   Installed "FSUIPC4 for Advanced Users.pdf" okay
   Installed "FSUIPC4 History.pdf" okay
   Installed "The 2016 List of FSX and P3D Controls.pdf" okay
   Installed "FSUIPC Lua Library.pdf" okay
   Installed "FSUIPC Lua Plug-Ins.pdf" okay
   Installed "Lua License.pdf" okay
   Installed "Lua Plugins for VRInsight Devices.pdf" okay
   Installed "LuaFileSystem.pdf" okay
   Installed "Example LUA plugins.zip" okay
   Installed "ASN WX Radar facilities in FSUIPC4.pdf" okay
   Installed "Offset Mapping for PMDG 737NGX.pdf" okay
   Installed "Offset Mapping for PMDG 777X.pdf" okay
   Installed "Offset Mapping for PMDG 747QOTSII.pdf" okay
   Installed "FSUIPC4 Offsets Status.pdf" okay
   Installed "Profiles in Separate Files.pdf" okay
   Installed "FSUIPC4_Loader.dll" okay
===========================================================

All installer tasks completed.
Registration dialog exit: selected  FSUIPC CHECK
Checking FSUIPC registration ...
Registration check for FSUIPC4 was successful! (result code 00)

*************** End of Install Log ***************
 

I have searched for a solution on the internet, but none of the cases I found matched my situation (most of them involved having FSX and FSX:SE coexist, or at least having been installed once on the same system, which is not the case here). Hence I am reaching out to you.

Is there anything I could do to resolve this without tinkering with file paths and names?

On another interesting side note, the installer somehow found a reference to Prepar3D v3 in the registry even though I've never used Prepar3D before (I don't even have a license for it). I've let FSUIPC fix that though.