Open95Keygen PSX

by Alex Free

Open95Keygen PSX is an open source Playstation 1 homebrew program that generates random valid Product Keys (both OEM and Retail types) for Microsoft’s Windows 95 and Windows NT 4.0 operating systems. It is a port of my Open95Keygen program to the PSX.

open 95 keygen psx in pcsxr

The Windows 95/NT 4.0 OEM/Retail Product Key algorithms have been reverse engineered by many people. Open95Keygen is a clean room design implementation not based on any existing software, it is written based on the specifications of the algorithm which is inherently not copyright infringement. I was inspired to write Open95Keygen after watching the YouTuber stack smashing’s video Why 111-1111111 is a valid Windows 95 key.

Table Of Contents


Version 1.0 (5/11/2021)

Open 95 Keygen PSX for American Playstations

Open 95 Keygen PSX for Japanese Playstations

Open 95 Keygen PSX .exe file

Source Code

View all releases.


First, download the right release for your console, or compile Open95Keygen PSX from source.

Burn and boot a CD-R on your PS1 or PS2 console using a method to start backup CD-Rs, or load the standalone .exe by other means.

Make sure a controller is connected, and simply press the cross button. Retail and OEM Product Keys will be displayed. You can press the cross button for even more keys as much as you want.

Build From Source (Extremely outdated with current PSN00BSDK)

Open95Keygen PSX is made using Lameguy64’s PSn00bSDK and MKPSXISO. This is the expected setup:

Next you need to place the file LICENSEJ.DAT (for building Japan bin+cue) in the same directory as the makefile to license the built images. These files can be obtained from the official PSX PSYQ SDK.

Make rules:


Open95Keygen and Open95Keygen PSX are released under the 3-BSD license. For more info, see the file license.txt in each release.