Troubleshooting & Support

Unable to create add-on entry for MSFS error

Instructions on recieving the "Unable to create add-on entry for MSFS 2020/2024" error in the CSS Launcher.

Updated 2026-05-30

This error means that the CSS Launcher was unable to add its entry to your simulator's exe.xml file.

This means that the CSS Launcher will not autostart with the sim, you will have to run it manually.

You can add the exe.xml entry manually by opening exe.xml with notepad and pasting the following code:

<Launch.Addon>

<Name>CSS_Launcher</Name>

<Disabled>False</Disabled>

<Path>D:\CSS Launcher\CSS_Launcher.exe</Path> <CommandLine>from_msfs</CommandLine>

</Launch.Addon>

Make sure to change the <Path> value to your CSS Launcher.exe path.

Related articles

Browse similar articles

Back to all articles

Need support?

Open the CSS Support Center

Open Support Center

Source: CSS Launcher User Manual, Rev. 5 — December 2025.