It's a fairly common practice (at least among the more geekly inclined) to open notepad to jot some quick notes, keep a running list, and otherwise use it as, well, a notepad. It's great when formatting is unnecessary, or would even create problems. My Dropbox has many of these handy notes, containing everything from rarely used passwords to software serial numbers (that I own, legally), to my frequent flyer account numbers, and even a few moldy code snippets.
I was shocked -- and I mean that -- when I read that Smart Office couldn't edit .txt files. It easily handles far more complex -- and proprietary -- formats, but the lowly text doc is too much? Please tell me it's an error! (Yours or mine -- I don't care!)
This is intentionally a bit tongue-in-cheek, but it's a very real issue for me, and it could prove to be a deal-breaker for this old nerd.