About second one - i also thought that is some kind of LOD texture, for more distanced objects or maybe for rendering from distance. I think I'll made some test with it.
But the first one isn't looks like random texture. I mean, i found this one: link and there is, that "-" should be prefix, not inside of texture name... Don't know what this one can be.. Some kind of specular map? But in 1998? Hmm...