I’ve mainly used OSX/MacOS tho right out my life, but have used Windows for work. From my understanding, installing an app on Windows scatters files throughout the OS and makes it sometimes difficult to fully uninstall an app. Often times there are files that are leftover.
In macOS it’s super easy because with a lot of apps, the files are bundled within the app itself making it easier to remove.
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.DLL files are files that can be used all across an operating system by different apps. They each are there for very specific tasks, such as allowing the app to change volume.
When downloading an app, it will check if any .DLL files it needs are already on the computer, and not download a duplicate. So when uninstalling, it may have a file that a different app requires, and the app is saying to windows “keep that file, I still need it!”. And you get left over files.
If you do delete the left over files, the app should have a program that checks for the presence of all the .DLL files and if one isn’t found, it reinstalls it.
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