If I try to open any MXD by double-clicking it from Windows Explorer or ArcCatalog, ArcMap fails to open.
I can see in Task Manager that
ArcGISFileHandler.exe briefly runs, then closes, but
ArcMap.exe never opens. If I first open ArcMap, then load the MXD, it opens correctly. This happens with any MXD.
Is there anything I should check before reinstalling ArcGIS? Windows 7 and ArcGIS 10.2.1
Edit - I just noticed that double-clicking an *.sxd does work - the document is opened in ArcScene. Why would there be a difference between ArcMap and ArcScene? I would think that a problem in one program would also apply to the other.