You know how the graphics files in 1.00 are all in a different format than the 1.07 ones? Well, I found out why.
Recently, I've been digging into game file formats, to help out some Italians with their efforts in translating old games (the same guys who translated C&C95 to Italian), and pretty quickly I came across compression in graphics formats. The simpler of those, RLE, simply collapses duplicate bytes, but there's a more complex one, namely LZW, which took me quite some time to wrap my head around. To give you some context, LZW is the compression used in GIF images.
Now, the people of the RedAlert++ project told me that the older Westwood games used LZW compression, but around the time Dune II was released, the patent owner of LZW was starting to notice that loads of companies used LZW in their applications without paying royalties. Because of this, Westwood developed their own LCW algorithm, which is a variety of LZW (combined with RLE I think) which differs enough from normal LZW to fall outside its patent.
So I suspect the v1.00 files are all compressed with LZW, and the files were replaced with LCW-compressed files in v1.07 to avoid any chance of legal troubles
As a side note, this means that fairly soon I'll have a reader/converter for the Dune II v1.0 graphics formats