If I double click on an MS Office file (powerpoint, excel, word) file, it opens a "save file" dialogue box, not the "open file" dialogue box, so I can never open any files. Even if I right click on the file, and select "open" from the drop down, the "save file" dialogue box still opens. The only way to open a MS Office file from the explorer is to right click, and then select the "Edit" drop down option. Then the file opens normally. Why doesn't my double click work anymore? This is only on opening MS Office files. PDF files open normally with a double click.