I've been using Corel X3 and saving the files as Illustrator v6.0 files. This is how I re-created the C6RS/ Pratt&Miller  logos with splines, then converted to vertices as I needed to shade each letter facing (S, as well as the P&M writing under the C6RS)

Carrara 7 Pro, Anime Studio Pro 8, Hexagon 2.5, Zbrush 4.6, trueSpace 7.6, and Corel Draw X3. Manga Studio 4EX, Open Canvas 5, WACOM Cintiq 12WX User