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I was wondering why my TortoiseSVN folder overlay icons weren't showing up after upgrading to Windows 10. After some digging, I discovered that Windows 10 can only handle 15 such icons at any one time.

If you aren't familiar, the icons I'm talking about are the little tick icons that appear on synced folders when you use programs like Dropbox or Google Drive.

This means there's a hard limit on the number of these kinds of programs you can use before the icons fail to display and you don't know what states any of your files are in.

OneDrive (formerly Skydrive) is such a program, and it not only comes bundled with Windows 10, but it cannot be uninstalled from Windows 10 without jumping through some absurd hoops.

So about half a dozen of these folder overlay slots taken from near the start of the list that are used up, even if you never use OneDrive, and it can prevent icons from your other programs from showing up.

In order to get around this limit, you need to go into the registry and manually rename all the icons[^] to appear before the OneDrive icons.