MMGL_ADEX_PM.BGL scenery won't show - need detailed install help

Short version first: a lone .BGL file will not show in MSFS unless it’s inside a valid package that goes in the Community folder. Also, that filename (MMGL_ADEX_...) strongly suggests an ADE/AFCAD made for FSX/P3D, which MSFS won’t use as-is.

Do this step-by-step:

• 1) Verify what sim it’s for
  • Open the included instructions/readme.
  • If it mentions Addon Scenery\scenery or Scenery Library, it’s for FSX/P3D.
  • If it’s FSX/P3D, it won’t work in MSFS without being rebuilt.
• 2) If it is truly for MSFS (author states MSFS/FS2020):
  • It must come as a full add-on package (a folder containing manifest.json and layout.json).
  • Install by dropping that entire folder into your Community folder.
  • Do not place only the .BGL in Community. MSFS won’t load it.
• 3) Clean start and test
  • Temporarily move other MMGL add-ons out of Community.
  • Start the sim. Spawn at MMGL and check for changes.
• 4) If it still doesn’t show
  • Close the sim.
  • Delete the scenery index cache. The sim rebuilds it on next start.
  • Typical locations:
    %LOCALAPPDATA%\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\SceneryIndexes
%APPDATA%\Microsoft Flight Simulator\SceneryIndexes

  • Restart the sim and try MMGL again.
• 5) Conflict check
  • Make sure you don’t have a marketplace or other third-party MMGL enabled.
  • Test with only this MMGL add-on installed.

Important notes:

• If your download only contains MMGL_ADEX_PM.BGL and no manifest.json/layout.json, it’s almost certainly an FSX/P3D AFCAD.
• FSX/P3D-style AFCADs do not override MSFS airports by just copying the .BGL anywhere.
• For MSFS, you either need the proper Community-ready package from the author, or the airport must be rebuilt/packaged with the MSFS SDK.

To help further, please confirm:

• Which sim/platform build are you on (MSFS, Steam or MS Store, version)?
• Exactly where did you put MMGL_ADEX_PM.BGL?
• Does your download include manifest.json and layout.json, or only the single .BGL?
• Do the instructions mention Addon Scenery\scenery or the Community folder?
• Do you have any other MMGL add-ons installed?