I haven't used Mandrake in a while now, but have a look at this
. You're talking about the numerical values in that permissions column, yeah? Here's a little bit of info:
There are 3 numbers, from right to left, they are the permissions of the owner of the file, the file's group and everyone else. For each of those columns, you can set 3 permissions on the file: read, write and execute. Read has a value of 4, write 2 and execute 1. You just add them up. So for example, if a file has a 7 in the first column, that means its owner and read, write and execute the file (4 + 2 + 1 = 7). If you see 777, the owner, all users in the file's group and everyone else can read, write and execute the file. There's some more info about this here
(although it's just a general Linux thing and not specifically for Mandrake).
Edit: I should also mention that you set permissions on a file with the chmod command. Open a terminal and type "man chmod" without the quotes for more info.
I'm not sure about "wheel", though.
Hope that helps a little bit though.