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5ecfd27e8f
The bug that prompted enabling 8.3 filename creation was fixed 5 years ago, see https://github.com/xamarin/xamarin-android/issues/3407:
> Fix included in Xamarin.Android 10.1.0.30.
>
> Fix included on Windows in Visual Studio 2019 version 16.4.
We're on VS 2019 16.11: 9815039618/images/windows/Windows2019-Readme.md (L233)
8.3 filename creation is known to hurt file creation performance, especially when there are a large number of similarly named files in the same folder:
* https://learn.microsoft.com/en-us/archive/blogs/josebda/windows-server-2012-file-server-tip-disable-8-3-naming-and-strip-those-short-names-too
* https://www.linkedin.com/pulse/dont-forget-disable-short-filenames-83-servers-folders-wes-brown
* https://deep.data.blog/2013/06/19/debugging-story-slowness-due-to-ntfs-short-file-8-3-name-generation/
I created a new VM with the base Azure Marketplace Windows 2019 image and confirmed that 8.3 name generation is disabled by default for both the OS and temp disk:
```
fsutil 8dot3name query C:
The volume state is: 1 (8dot3 name creation is disabled).
The registry state is: 2 (Per volume setting - the default).
Based on the above settings, 8dot3 name creation is disabled on C:
fsutil 8dot3name query D:
The volume state is: 1 (8dot3 name creation is disabled).
The registry state is: 2 (Per volume setting - the default).
Based on the above settings, 8dot3 name creation is disabled on D:
```
This might help a bit with https://github.com/actions/cache/issues/752, although I haven't tested it, and AFAICT it's unlikely make an order of magnitude difference.