http://chestofbooks.com/architecture/Building-Construction-V2/index.html#.VhkzkitXnfs

Brownstone

Window dwg and dxf files galore

Pella

http://professional.pella.com/adm

Milgard

http://www.milgard.com/professionals/technical-resources

http://www.milgard.com/sites/default/files/series-detail/files/cad/3275-01-v_double-hung_woodclad.pdf

Andersen is the largest manufacturer of windows in North America.
They have a free program to design windows and export the files!

http://www.andersenwindows.com

http://www.windsorone.com/cad_molding_type.php

http://seek.autodesk.com/category/Doors?source=QuickLinks&resetft=true&locale=en-us

Jeld-Wen

http://www.jeld-wen.com/