You might be able to use Win32::API and SetVolumeMountPoint to do this. There is a little more information here and some sample C code here.
You might also get away with shelling out to the subst command
P:\test>help subst
Associates a path with a drive letter.
SUBST [drive1: [drive2:]path]
SUBST drive1: /D
drive1: Specifies a virtual drive to which you want to assign
+ a path.
[drive2:]path Specifies a physical drive and path you want to assig
+n to
a virtual drive.
/D Deletes a substituted (virtual) drive.
Type SUBST with no parameters to display a list of current virtual dri
+ves.
which might be simpler, but would require you to detect where the USB drive was so that you could subst it to a well-known place.
Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail
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