I just bought WC3 default Window size is tiny :( Is there anyways i can change the size of the Ressolution for wing commander 3. Window is size of a postcard! really tiny compared to using my screen size. Really dont know how to alter this. New to buying Gog games. But wanted play this for so long. Any help would be appreciated.

Why don't you just Alt+Enter and play on fullscreen?

Check GOG's Wing Commander forum, your question has probably already been asked and answered there:
http://www.gog.com/en/forum/wing_commander_series/#1339457050

Thank you so much never new this. grateful to you.

Make sure to mark one of the answers as a solution.

I like playing games in a window, and DOSBOX can be configured to scale the game's display up. I'm playing The Pandora Directive that way.