ino files defaulting to pdf

everything installed fine and I ran version 1.0 I compiled a program and it works. now upon wanting to edit the program it defaults to a pdf. I have adobe X loaded I tried setting the default program various ways arduino does not show up as a program to set the default to. I uninstalled adobe X and tried again this time it show defaulted to notepad. tried again to set the default to arduino it still does not show up.
I looked at the adobe program could not see anything there any thoughts how to fix this.
doc

Operating system?

On Windows: right click on program, select 'open with', then 'select standard program' and then you get a Window where you can choose for a few programs, or choose to browse for another program. Browse for your Arduino programmer and select it. Then it should work.

On Mac: I don't know...

Good luck,

David