• backup project

• grab scripts from this repository: https://github.com/in0finite/uDLLUtils, and copy them to Editor folder

• make sure that asset serialization mode is set to text (restart Unity after you change it)

• open window (from menu: Window => MetaFileUtils), click “Refresh list of dlls”, select your DLL, and save DLL script ids to file

• close Unity

• copy script files to project

• start Unity (it will generate meta files for scripts)

• You may now see some compilation errors. That could be because some types/method calls are ambigious. Now exclude DLL from compilation (select your DLL in project view, check “Editor” under “Exclude platforms” in inspector, and click Apply ).

• now the project should compile fine, and “Assembly-CSharp” DLL should be created which holds all added scripts

• open window, click “Choose source xml file with script ids”, and select previously saved script ids file

• check or uncheck “Test only” depending on if you only want to test it or not

• replace script ids by clicking “Replace”

• Now the scripts should be replaced. Restart Unity so that it reloads all modified assets. Now you can delete your DLL from project.

Notes

• if your DLL project required preprocessor defines, you need to add them to Unity project