I've seen this compression before. In the files there are text string but with incomplete letters in some cases, also there are indices with a weird order or incomplete patterns. so, I supposed that are compressed.
this is the header structure in all files with respective variants obviouslly.
The original header of the file is RTTIBin<2.12> so again I suppose that this header represents the compression.

Here are some examples:
http://www.mediafire.com/file/5uky77vxc ... racter.rar
http://www.mediafire.com/file/sqq4da1v5 ... racter.rar
http://www.mediafire.com/file/5cw54krmv ... racter.rar
http://www.mediafire.com/file/gd39oldxm ... _lines.rar
http://www.mediafire.com/file/98becwe11 ... racter.rar
Someone can recognize and figure out the compression?
Thanks!