BUG #4701: (minor) MSI Installer fails on subst drives

The following bug has been logged online:

Bug reference:      4701
Logged by:          Egbert Teeselink
Email address:      e@teeselink.nl
PostgreSQL version: 8.3.6-2
Operating system:   Windows XP Home NL (32-bit)
Description:        (minor) MSI Installer fails on subst drives
Details:

I have most of my non-OS files in a directory called c:\diskq and use the
Windows "subst" command to create a virtual drive Q: that points there. When
trying to install PGSQL from the Windows installer in from
Q:\etc\pgsql\SETUP.bat, the installer complains that it cannot open
postgresql-8.3-int.msi even though it really is located in Q:\etc\pgsql\.
The problem is solved by running the setup from c:\diskq\etc\pgsql\SETUP.bat
instead of Q:\etc\pgsql\SETUP.bat.

A similar error occurs, however, when trying to install *to* a "subst" drive
(but, miraculously so, only after a number of files are copied).

The problem is easily solved by only installing from and to the same paths
on the "real" drive though. Maybe at least worth a FAQ entry?

Good work on the installer!