Can anyone please help me print custom size (e.g., not C5, B5, #10, etc.) envelopes from a .pdf file? I'm on a PC, and I have no clue how to set up a custom-sized envelope that I can select for printing. It doesn't even appear to be an option. Any thoughts, ideas, suggestions? Thanks...

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic