# FMODStudiol.dll file stays in the project when switching branches

**URL:** <https://qa.fmod.com/t/fmodstudiol-dll-file-stays-in-the-project-when-switching-branches/18069>\
**Category:** Unity\
**Tags:** unity\
**Created:** [December 8, 2021, 3:51pm UTC](https://qa.fmod.com/t/fmodstudiol-dll-file-stays-in-the-project-when-switching-branches/18069 "2021-12-08T15:51:18Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![richard\_simms](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/richard_simms/32/261_2.png) [@richard\_simms](https://qa.fmod.com/u/richard_simms)\
**Post date:** [December 8, 2021, 11:53pm UTC](https://qa.fmod.com/t/fmodstudiol-dll-file-stays-in-the-project-when-switching-branches/18069/2 "2021-12-08T23:53:58Z")

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That DLL will be the DLL that Unity is using to run FMOD in the background. It cannot release it whilst the Unity project is open, which is by design, so you will need to close Unity before changing branches.

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_[View the full topic](https://qa.fmod.com/t/fmodstudiol-dll-file-stays-in-the-project-when-switching-branches/18069)._