1. Start, click Run, type Regedit in the Open box, and then click OK.
2. Browse to HKEY_CURRENT_USER\Software\Classes\.html
3. Right click the value for the .html key and select Modify…
4. Change the value from "ChromeHTML" to "htmlfile"
You can also check under HKEY_CLASSES_ROOT
Look for \. HTM and \.HTML adjust the default settings to reflect “htmlfile”
Possibly check under all html settings under current user and HKEY_Classes_Root htm, html, shtm, shtml. Google Crhome even once uninstalled still kepps reg settings. The bad part is you dont need Admin rights to install Chrome so it can be very detrimental to your network if certain sites only work with Explorer.