Drive letters don't show in many browse buttons, After effects, etc.

Hi all,
Oh boy is this strange. I just discovered that in After effects, & cinema 4d , that i can not select any drive letters to browse for folders.

For example, In after effects, I want to choose a different drive path for my cache data. ie, M drive instead of C drive by default
(Please look at image) (please see video demo) as you can see I do not get any choices to select different drives. There should be a "COMPUTER" icon but i can only select folders in the c drive.

Now, some people say its a permission problem. But I looked into that, it doesn't seem to be it.
Are there any computer nuts out there that can figure this out?
Thanks,
Lou

Hi again,
Ok I tried what you said, but akk that does is open a seperate window with the drives. When i se;ect a drive, it doesn't add it to browse box.
P.S you don't need to know After Effects. This is a windows issue that is effecting After effects * Cinema 4D. I am trying for some sort of a work around to lead to another drive OR fix the reason I am limited to only the Desltop Icon.

Also, I even tried adding a shortcut of the M drive to FAVORITES And it did select it, but the true path was C:\favorites\Mdrive folder (which was in the dam C drive! )

yeah thanks anyway, I was hoping for some computer tech guys that know work arounds to this problem
thanks anyway