I am running Photo Mechanic version 5, build 15277 (oebcc6a) on Windows 7x64.  My pc recently needed a rebuild after powercuts.  I reinstalled an earlier version of camera bits by mistake and uninstalled it and then reinstalled with this version.  However, I cannot make it my default program for opening raw files from windows explorer.  I go through all the usual moves etc  but it will not show up in the list of available programs after I have clicked on the camera bits exe file.   Can you help