Hi! 
  
I have downloaded the latest FSUIPC4 that should work in FSX:SE but when I try to install it it says that cannot edit FSX DLL.XML file to active FSUIPC. I have run FSX:SE before running the FSUIPC installer. 
  
  
Intaller says: 
  
Installer for FSUIPC4.DLL version 4.938f
 
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:\Program Files (x86)\Steam\steamapps\common\FSX
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:\Program Files (x86)\Steam\steamapps\common\FSX\
Looking in registry for Prepar3D 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! ...
===========================================================
 
INSTALLATION FOR FSX:
SetupPath="C:\Program Files (x86)\Steam\steamapps\common\FSX"
Checking version of the FSX EXE:
... Version 10.0.62608.0  (Need at least 10.0.60905.0)
Checking compatibility with installed SimConnect:
    Found SimConnect build 60905 (Original)
    Found SimConnect build 62608 (Steam)
    Found SimConnect build 61242 (SP1 May07)
    Found SimConnect build 61259 (Acc/SP2 Oct07)
Checking if there's already a version of FSUIPC4 installed in:
       C:\Program Files (x86)\Steam\steamapps\common\FSX\Modules\FSUIPC4.DLL
... Version 4.938f found.
FSX Modules folder already exists.
Okay -- installed FSUIPC4 into "C:\Program Files (x86)\Steam\steamapps\common\FSX\Modules\FSUIPC4.DLL"
Looking for the current user's Application Data path: 
... found as "C:\Users\Lauri\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\Lauri\AppData\Roaming"
 ... No FSX.CFG there
Looking in "C:\Users\Public\AppData\Roaming"
 ... No FSX.CFG there
Cannot edit the DLL.XML file to activate FSUIPC.
 
Greetings from Finland
 
Lauri Aho