If you open Wordpad first then ask the program to open(file - > open) then find the file, does it open ok?
Open office has way more features then WordPad, but is not as fast to open.
I blanked out your e-mail because spammers will get it and send you tons of junk.
When it asks you what to use, Select Browse and tell it to use ""%ProgramFiles%\Windows NT\Accessories\wordpad.exe"" without the ""s