Arbitrary Editor for Mac

I need a text editor on mac that could open arbitrary file and show its content.

For example, I want to open "test.pages" file, because I am curious. Textedit denied to open it, textWrangler opened it in disk browser. TextMate did open it , showing first 2 characters as PK, (which i understand as a packed file), but it showed lots of special characters as white spaces, which is not acceptable.

Notepad (or any XYZ editor on windows) could open arbitrary files, without ever complaining about "format".

(On the side note, is there anything I can do to make MAC OS not think of me as an extremely stupid guy who has no technical knowledge at all?)