App + Service Icons
The Dropbox link contains four folders, two called “black” and two called “white” each with its respective color of the icons. Each color has .png and .ico versions. Each icon is 256 x 256 and supports transparency. I found most of these icons by hunting in the Windows 10 system files.
To download them, click here.
System + Folder Icons
Two folders here, one is virtually a direct extraction of the .dll files in Windows 10, and the other is a version of the icons in PNG (some icons didn’t convert, however, and are missing). Download here.
Note: these are for personal use only, and Microsoft owns the rights to most of these images.