Need a help

[Taloncigar]

Hi everybody. I am new of CM. Actually a Campaign Series player so far, but now I purchased a collection of the three games CMBO, CMBB and CMDAK, I tried to download all the possible CMBB scn from the club archive and now I have some 430 .cme and .cmf files into my 'Scenarios' folder in the game Directory, but apparently I can see only a barely hundred when I open the 'choose a scn' window of the game..so now I have some question and would be grateful to anybody who'd give me an answer.
Why I cannot see all the scn I downloaded into my game directory?
What the difference betwee a .cme and a .cmf file?
The scn in the CMDAK archive of the club seems to be mixed CMDAK and CMBO..is it so?
Thank you for the help
Taloncigar