Yes, I'm using FS2_Open.
Ver 3.6.7, I think is the number - filename is "fs2_open_G-20050722.exe". (I have the original disks, actually, but it does want to 'play nice' with WinXP)
Dumping the directory and filtering for .vp files, I get
Kara_Temporary_asEffects_Workaround.vp, mv_aseffects.vp, mv_core.vp, mv_effects.vp, mv_models.vp, mv_textures.vp, Root_fs2.vp, smarty_fs2.vp, sparky_fs2.vp, sparky_hi_fs2.vp, stu_fs2.vp, tango1_fs2.vp, tango2_fs2.vp, tango3_fs2.vp, warble_fs2.vp
3.6.5 did go in first, so there may be one or two relics in there that shouldn't be, but I didn't see any mention of removing anything.
As to breaking the Mekhu, that's entirely my fault. I 'cleaned up' the whitespace and commenting in the .tbl I extracted from the mv_aseffects.vp. Apparently, I got a bit enthusiastic with the delete key. It's fixed now. (The Maxim is still borked, otoh)