There is an environment variable UGII_MOVIE_CODEC which you can set to change the codec used.
In my testing I found I had to install the K-Lite Codec Pack (32 & 64bit).
Then set the UGII_MOVIE_CODEC value to FFDS, XVID, X264 or LAGS.
Can't remember if there was any trick with the install of the codec pack.
However I record a lot of videos for NX and I always use either Snagit or Camtasia.
Never bother with the internal recorder.
Snagit is great for quick videos that don't need editing or annotations but it will only do MP4.
Camtasia is for edited or narrated ones, we always output in MP4but there are other formats it can produce.
One thing I have to say for Microsoft Video 1 format is the compressibility with RAR is amazing.
Anthony Galante
Senior Support Engineer

NX5.0.6, NX6.0.5, NX7.5.5, NX8.0.0 -> NX8.0.3
NX8.5.0 -> NX8.5.3, NX9.0.0 -> NX9.0.2, NX10 Beta