http://bugs.winehq.org/show_bug.cgi?id=20354
--- Comment #4 from Damjan Jovanovic damjan.jov@gmail.com 2009-10-14 08:34:27 --- It's a fairly obscure Microsoft-proprietary API for still image devices, intended to kill open and portable standards like TWAIN, so how does one uncommon app make it "crucial" :-) ?
If Sony Vegas does not use WIA a lot, it may be possible to write a very simple stubbed WIA implementation that just fools Sony Vegas into starting but does little else. It won't actually work with a camera or scanner.
I'll have a closer look when I get home.
Does the trial version have the same problem? Are you willing to try some patches?