Windows 10 Explorer only uses the first 10-15 icons. The rest are ignored. I use TortoiseSVN daily for source code control. I use DropBox occasionally for a non-professional group. I can manually change the DropBox icon references (e.g. DropboxExt01, 02, 03, ...) so they are ignored. Everytime DropBox does a software update though (it seems to do this on its own) it overrides my registry changes. To fix this, I use regedit to rename or delete the DropBox entries and reboot, but it seems that within a week, things are broken again forTortoiseSVN, and DropBow icons are back.