Cause: This is a problem with your file type settings.
Solution: In Windows Explorer, go to Tools > Folder Options > File Types and scroll down to “HTML” or “HTM”. Check the values there. Click “Advanced” at the bottom right. Assuming you’re using Internet Explorer, click “open”, then click “Edit”. Under “Application used to perform action, the entry should be
“C:\PROGRAM FILES\INTERNET EXPLORER\iexplore.exe” -
(Check the path to iexplore.exe to make sure it is correct.)
“DDE” should be checked. In the boxes below it you should have, in order,
If this is incorrect, change the values to the above. If it’s correct and you still have problems, go to Start > Run and type in “regsvr32 urlmon.dll”. Next, open Internet Explorer and go to Tools > Internet Options > Programs, and click “Reset Web Settings”.