Where did you get that MVE player code?
The MVE format was reverse engineered even before
released the source code for FS2. MVE format movies were used for other games before FS2 and a decoder was made for one of those other projects. It was modified to read 16-bit MVEs and used for the icculus.org version. That icculus.org version was later modified to run faster and intergrate just with the FS2 source rather than work as a standalone player. "that_player" is basically the original code with both 8-bit and 16-bit support but with a few minor changes so that it could be used as an external player for FS2_Open (and then not be integrated into the source). Actually using it as an external player never panned out though, OGL was ok but D3D hated it.
Will it find its way into Win32 builds ?
See CaptJosh's post. Though it should also be known that the decoder has been publicly available and used in multiple opensource projects for nearly 4 years now. SCP isn't in less danger because of that but Interplay is kinda screwed if they really wanted to protect the format. Their lawyers could still be unleashed at any point but this is the Internet age and once Pandora's box gets opened, it doesn't close again.
Is a MVE player already included in the Linux and OS X versions of FS2_Open 3.6.7?You'll just have to use one of them and find out.
(note that those versions don't have AVI support)
Does a MVE player already exist for the Win32 version of FS2_Open?Yes.
Will it make it into public Win32 builds?Can't say, not my decision. And don't bother asking around or the answer will likely be an official "No." If it hits CVS then yippee, if not then that's too bad.