[BUG?][FIX?] - driveName existence on windows

Hi all!,

I was using SqueakAmp on windows, and had a problem 
when tried to access mp3s files from a cd, if typed 'E:'
(where is located the cd driver)
to set the root directory it says 'there is no directory called E:'

The problem is that something like this:
FileDirectory basicNew fileOrDirectoryExists: 'C:'
answers false.

So, if this a bug the attached cs corrects this.

If this is not a bug please correct me.

If this not breaks anything maybe the other senders 
of #splitName:to: should be changed in the same way
(using #activeDirectoryClass )

Best regards
Alejandro Magistrello

 <<driveNameExistence-fix-asm.1.cs>>

driveNameExistence-fix-asm.1.cs
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