When you install or uninstall programs in Windows 8, the file extension information about what program opens it will be changed. To re-associate the file back to the program you would like to open the file with, try the tips about how to associate a File Type or Protocol Default Program in Window 8.
* Set File Associations Through Default Programs
Open Control Panel, click on the Default Programs > Associate a file type or protocol with a program Link. You can also type Default Programs in Search bar and select it from the results.
Select a file extension type or protocol under the Name column, and clcik Change Program button, and select a listed program or exe file.
* If you need to establish the same settings for several Windows 8 computer or Surface Pro tablet, a specific app called GPO do the job.
First use DISM command to create/export your XML file mapping programs to the file type/protocol from a machine and then import it to others. How to use DISM Link http://technet.microsoft.com/en-us/library/hh825038.aspx