SharePoint Designer 2010 opening MasterPages and ASPX files as text

I recently installed SharePoint Designer 2007 on my new Windows 7 64-bit laptop after installing SharePoint Designer 2010 on the same machine. When I tried to open a MasterPage or newitem.aspx list form, it would only open in SharePoint designer as text with all the options in the ribbon greyed out.

The reason for this is the ASPX, ASP, Master, etc were set to open as text in SharePoint Designer 2010. To change this, open SharePoint Designer 2010 and do the following:

1. File –> Options
2. Select the General tab
3. Click “Application Options” next to “SharePoint Designer Application:”
4. Select the “Configure Editors” tab
5. Select ASPX ASCX ASHX….
6. Make Sure that “SharePoint Designer (Open as HTML)”
7. Click OK