Another Jam newbie question

From: Nicolas Fleury (nidoizo_at_[hidden])
Date: 2003-12-08 15:12:28

Hi,
How can insert a directory at the beginning of a path on Windows 
*after* the drive?
x = Z:\\b\\c\\x.txt
y = # how setting to Z:\\a\\b\\c\\x.txt using x

Thx

Nicolas