Research the extra byte introduced in RSW 2.5 (stored after the build number) and document it

[rdw-software]

It's evidently a boolean flag. From the auto-generated analysis results (value = count):

unknownRenderFlag = {
  [0] = 887,
  [1] = 78,
},

Someone - I forgot who - called it a "render flag", so that's why I've named it accordingly. Haven't looked into it at all, though.