I am runing Windows XL & have Adobe Reader X version 10.1.2, but it no longer opens anything as a default.
I've opened the Reader & checked "use as default", but nothing. It also does not show up as an available program when asked what program I want to use to open something.
Everything used to work well, did I mess up or did you?
What is Windows XL ?
Windows XP, sorry.
Try repairing Adobe Reader installed on your system via Control Panel > Add/Remove Programs.
Click on Change button for the Adobe Reader entry and follow the instructions.