Editing CVT Avant Stellar (section)

=== Software Version 4.00 for Windows 2000 / XP 32-Bit (Avant.exe) ===

[[File:Ver_400.png|thumb|CVT Avant Version 4.00 Software]]

Around the early 2000s, CVT released version 4.00 of their keyboard programming software, which runs only on Windows 2000 and Windows XP (not Windows NT 4.0 or earlier, and not Windows Vista or any later versions).

When this software version is installed, it replaces two of the Windows keyboard drivers (i8042prt.sys, the i8042 port driver, and kbdclass.sys, the keyboard class driver) with CVT's customized versions of those drivers, which support the ability to program the Avant keyboards through their software.

This software design relies on being updated in order to work with newer Windows versions, but the software was never updated to support Vista or later Windows versions, and so cannot work on those versions, due to driver signing requirements or other incompatibility of the Avant custom drivers with those Windows versions.

The 4.00 software version can send ("download") programming data to the keyboard, but cannot read ("upload") the programming from a keyboard.

As of 11/2023, this software is available as an [https://web.archive.org/web/20060911054427if_/http://www.cvtinc.com:80/downloads/Setup2k.exe executable] thanks to the Wayback Machine.