Fix: "A Microsoft SharePoint Foundation compatible application could not be found to edit this document."

You get the following error when trying to open a document stored on SharePoint in Microsoft Office 2010:

"The document could not be opened for editing.  A Microsoft SharePoint Foundation compatible application could not be found to edit the document."

Here are some things to check:

• Internet Explorer is recommended for best compatibility.  However if you’re using Firefox, there are some steps you can take as outlined in KB979634.
• Make sure you’re using 32 bit Internet Explorer.
• Verify the Internet Explorer Add-on “SharePoint OpenDocuments Class” is installed and enabled (be sure to Show All add-ons).  If it’s not installed, do a repair install of Office and check again.

8/26/2013 Addendum:
Thought I'd update with what I've found for Office 2013, but not tried at this point.  See this msdn forum:

• Office 2013 June CU (link)
• Registry changes to add a US local key as mentioned in the forum linked above.