Fix FSX menu music that will not play: use the correct UIMusic folder, convert tracks to PCM WAV, check volume and diagnose silent audio.
Custom FSX menu music normally fails because the track is in the wrong installation’s UIMusic folder, is not a true uncompressed PCM WAV, or was copied while FSX was open. Close FSX, export a 16-bit PCM WAV, replace one backed-up stock track, then restart and check the Music volume.
These instructions apply to Microsoft Flight Simulator X and FSX: Steam Edition. Microsoft Flight Simulator 2020 and 2024 use different audio and package systems.
Where is the FSX menu music folder?
FSX menu music belongs in the UIMusic folder beside the active installation’s fsx.exe, not in the general Sound folder or the Flight Simulator X Files folder under Documents.
- Boxed or DVD FSX: commonly
C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\UIMusic - FSX: Steam Edition: commonly
C:\Program Files (x86)\Steam\steamapps\common\FSX\UIMusic
Those are default examples for many 64-bit Windows installations, not guaranteed locations. Steam libraries can be on another drive, and boxed FSX can be installed in a custom folder. Find the fsx.exe you actually launch, then use the UIMusic folder next to it.
A mistake we see repeatedly is changing the boxed installation while launching Steam Edition, or the reverse. If both editions are installed, confirm the executable path rather than relying on a familiar desktop shortcut.
Which audio format does FSX music require?
The most dependable format for FSX menu music is a genuine uncompressed 16-bit PCM WAV, preferably stereo at a conventional sample rate such as 44.1 kHz.
Changing song.mp3 to song.wav changes only the filename; the audio remains MP3-encoded and FSX may reject it. Use an audio editor’s export or conversion function and select PCM WAV explicitly.
A WAV file is a container, so it can also contain ADPCM, floating-point or other encodings. Windows may play those files even when FSX cannot. During troubleshooting, avoid 24-bit, 32-bit float and compressed WAV variants and create a fresh 16-bit PCM export.
How do I replace FSX menu music correctly?
The reliable method is to replace one known-working stock music slot while preserving the original file outside the simulator folder.
- Close FSX completely. Check that
fsx.exeis no longer running before changing the files. FSX builds its interface-music selection when it starts. - Open the active
UIMusicfolder. Confirm that the same parent folder contains thefsx.exebeing launched. - Back up the original WAV files. Put the backup in a separate folder outside
UIMusic. Leaving extra WAV copies inside the folder can add them to the available rotation and confuse the test. - Export the custom track as PCM WAV. Use 16-bit PCM and a standard sample rate. Do not simply rename an MP3, M4A or other source file.
- Reuse one original filename. Give the custom WAV exactly the same name as the stock track it replaces. This avoids uncertainty over whether FSX will recognise or select a newly invented filename.
- Check the full extension. Enable file-name extensions in File Explorer and make sure the result is not
track.wav.wavor still an MP3 hidden behind a renamed extension. - Copy the file with the required permission. Windows may request administrator approval for folders under
Program Files. If an audio editor cannot save there, export elsewhere first and then copy the finished file intoUIMusic. - Restart FSX and test at the front-end menu. Enable simulator sound and raise the Music control in FSX’s sound settings.
If the replacement does not play immediately, temporarily move the other menu WAV files to the backup folder and leave only the custom replacement in UIMusic. FSX can rotate between available stock tracks, so hearing a different song once does not prove the replacement failed.
Why does stock FSX music play but my custom song does not?
If the original FSX music plays, the installation and basic playback path are working; concentrate on the custom file’s encoding, name and destination.
| Symptom | Likely cause | What to do |
|---|---|---|
| Stock music plays but the replacement is silent | Unsupported encoding inside the WAV container | Export a fresh uncompressed 16-bit PCM WAV |
| A renamed MP3 does not play | The source audio was never converted | Use an audio editor’s export function rather than renaming it |
| The custom song never appears in rotation | FSX is selecting other tracks or not recognising the new filename | Use an exact stock filename and temporarily remove the other WAV files |
| The file looks correct but FSX ignores it | It was copied to another FSX installation | Locate the launched fsx.exe and use its adjacent UIMusic folder |
| The copied file vanishes or remains unchanged | Windows blocked the write operation | Approve the administrator prompt and inspect the destination afterwards |
| A replacement changes back to the stock track | Steam file verification or an installation repair restored it | Keep a separate backup and copy the custom version back after verification |
What if FSX has no menu music at all?
If neither stock nor custom tracks play, restore the originals and troubleshoot FSX and Windows audio before converting the song again.
- Restore the stock files. Return the original WAV files to
UIMusicand restart FSX. - Check FSX’s sound controls. Confirm that sound and interface music are enabled and that the Music level is audible. Our breakdown of FSX’s separate sound controls explains how the simulator’s audio categories interact.
- Inspect the Windows volume mixer. Run FSX, open the mixer and make sure the application is not muted or set extremely low.
- Select the intended playback device before starting FSX. Older applications do not always follow a headset or speaker change made after launch, so restart the simulator after changing devices.
- Listen for engines, ATC and interface effects. If all simulator audio is absent, work through our complete FSX no-sound and playback-device checks.
- Repair missing stock files only as a last step. Steam’s file-verification function can restore damaged or deleted installation files; boxed FSX can use its installation repair option. Back up every custom file first because repair or verification can overwrite replacements.
Deleting FSX.cfg is not a sensible first fix for one silent music file. It can reset unrelated simulator preferences without correcting a misplaced or incorrectly encoded WAV.
Does FSX menu music play during a flight?
FSX menu music is intended only for the simulator’s front-end screens and normally stops when a flight loads.
The UIMusic folder is not an in-flight soundtrack or aircraft sound folder. Renaming a song or moving it into an aircraft’s sound directory will not make it play continuously; use a separate media player if you want background music while flying.