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.

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

Overview

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.

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