BlankMission.mis_xxx.ml generated

Hi-,
Last week I downloaded a BlankMission.zip from the net,
I have put the BlankMission.ter/BlankMission_texture.ts and etc to the related directory. I can start the mission
and go around, but the problem is that everytime
I loaded the mission, the BlankMission.mis_xxx.ml file
was created and it is quite random, in the result a lot
of similar files showed up in the mission directory.

I looked into the debug window, it said that it can't
find some kind of texture and then the default texture
being used.

I guess the BlankMission.ter might have the old texture
information in it( not sure), is there a way to get rid
of that problem?

Thanks a lot.