If Sony Vegas is like Sony Sound Forge (which I highly suspect is the case), then it doesn't render through DirectShow or VFW which makes it really annoying to feed stuff into, if the file isn't a format specifically supported by Sound Forge...
Dunno a solution other than reencoding unfortunately - I guess you could try searching to see if there's some add-on or something to get it to read using system codecs than stupidly using their own.

MPC/WMP definitely renders via DirectShow.  I would expect Windows Movie Maker to also render through MS's own DirectShow system.

(This post was last modified: 27/01/2010 03:57 AM by ZiNgA BuRgA.)