Thank you for answer.
This works.

To use double "//" was the trouble. See below, hard disk file addresses from
several browsers in NT4 (I suppose in all win32´s).
In the spirit of continuous improvement, you might add note of this to
instructions or tweak the code to accept address types below...

Mozilla 1.4b:  <file:///X:/>     (3 times /// ) 
"View page info" clicking the page by mouse results the same 

Opera 7.10 :  <file://localhost/X:/> (2 times //, adds localhost)
"Copy address" clicking the page by mouse results the same 

IE 6 :       X:\         (No file:// added)
Properties of the page show    file://X:\
"Copy address" not possible


Thank you again.