Tools used for editing

Here you will find a large (and growing) collection of editing tools and utilities. Make sure to consult the users on our forum when you are unsure how to get the tools to work, or how to use them for editing the game files.

General tools

🔧Pack/Unpack (Robert Szikszo)

Use this Pack/Unpack utility for simple DOS tools to pack and unpack .DAT files used by the game.

🔧DooDAT 1.3 - EXE Installer (Tim Medcalf)

This windows utility makes it very easy to work with .DAT files. There is not even a need to unpack and repack anymore, this tool streamlines all of that for you.

---

Track editing

🔧The NASCAR Racing 3 Sandbox - MSI Installer (Papyrus Design Group)

This set of tools was used by Papyrus to create the racing tracks that came with the game NASCAR Racing 3. We use it to create any new or updated track for Indycar Racing 2 / CART Racing as well nowadays.

🔧MRON section remover (Tjerk de Heer)

With this small Windows tool you can remove the extra "MRON" sections from all NASCAR Racing 3's .3DO files in a folder. After that those files can be converted using the N2/N99 to ICR2 track converter.

🔧Skidmark Generator (Checkpoint10)

Converts .CSV (Comma Seperated) file to .TSD file for loading in OPE. This can be used to add skidmarks to the track. Instructions on how to use this tool can be found on the forum.

🔧Camera positions from CSV (Checkpoint10)

This tool can be used to convert .CAM and .SCR files containing the game's camera positions to .CSV files for editing, after which they can also be compiled again to files understood by the game. More info about this tool on the forum.

🔧INS to OPE Converter (Ton Fastwalker)

Convert 3doEd inserts.txt to .OPE text format to reload objects into a track using N3 Sandbox. Very useful when you want to edit an existing track. This tool is very useful for editors but might have a steep learning curve. Read the readme files inside the .zip archive and check the Tutorials section.

🔧Bankedit (Chas Bornemann)

This program can change the height lines of a track in degrees. That means you can easily flatten tracks, and increase or decrease their banking. Unfortunately, wall heights still need to be repaired by hand in a tool like 3doEd.

🔧Banking editors (Jarp90)

Various banking and height editor tools for NASCAR Racing 2 and Indycar Racing 2. Check out the various readme files on how to use each tool.

🔧GPL to ICR2 Converter (Ton Fastwalker)

Use this tool to convert a GPL .TRK file to the Indycar Racing 2 .TRK format. Keep in mind that this might produce a .TRK not yet usable in ICR2 directly, as it might contain more than the 10 allowed E-lines.

---

3D Objects

🔧3DoEd 1.0i (Dave Noonan)

Use this program to view and edit .3DO files directly.

🔧3DoEd 1.5s (Dave Noonan)

Use this later version of the 3doEd program to view and edit .3DO files directly.

🔧3do Tools (Marcelo Bassino)

These DOS tools can be used to unpack .3DO files to .TXT format for editing and then back into 3DO format again. There is also a tool to edit 3DO files visually.

🔧3D to 3DO (nooRok)

This is an alternative method for the 3D to 3DO program from the NASCAR Racing 3 Sandbox linked above. With this Python script you can convert track files from 3D to ICR2 format .3DO directly. This eliminates the need for running the object through the MRON utility and NASCAR 99 to ICR2 converter, speeding up the track creation process. The script can also be used to convert other .3D objects for the game, such as carshapes and track side objects.

You will also need the ICR2 3D Model from nooRok. Refer to this post bij Checkpoint10 on how to use these scripts.

🔧.3D to .3DO Guide

It is possible and relatively easy to make your own .3D text files to convert to .3DO using the 3D23DO program from the NASCAR Racing 3 Sandbox. A complete guide has been written by Pavel69.

🔧3doBuild (Robert Szikszo)

Robert Szikszo made a tool that you can use to create objects from scratch. Many of his scratchbuilt carshapes were built with this tool. His program uses text files that are turned into .3DO files directly. It has a relatively steep learning curve do if you want to create objects from scratch, the below method documented by Pavel69 might be a more viable solution.

🔧Blender 3DO Plugin (nooRok)

Import and export 3DO files with the popular Blender 3D program. We linked to the Github location above, but we also mirror the script here for archival purposes.

---

Image files

🔧WinMip 1 (Klaus Hörbrand)

With Winmip 1 you can convert some additional image files used by the game, that have been dropped from Winmip 2. For example the STP files.

This program requires the file MSVBVM50.DLL to run correctly. Just drop it in the Winmip folder. We verified this website as a legimitame resource to download said file as of 25-01-2026. Still: use at your own risk!

🔧WinMip 1 Roledit plugin v1.1. (Klaus Hörbrand)

This plug-in adds ROL support to Winmip 1 (version 1.1).

🔧WinMip 1 Roledit plugin v1.2. (Klaus Hörbrand)

This plug-in adds ROL support to Winmip 1 (version 1.2).

🔧Last Chance Tools (Róbert Szikszó)

The Last Chance Tools often provide better .MIP image quality than WinMip, and can also convert .PMP files much better.

---

AI

🔧.LP Edit (Róbert Szikszó)

A full set of tools to work with .LP files in ICR2. Includes conversion tool for replays to use as .LP files, as well as a graphical editing tool called Trafo.

🔧AI Edit (Nigel Pattinson)

AI Edit offers a graphical approach to editing LP files. More information on its use starts at this post on the forum.

🔧.RPY to .LP (Checkpoint10)

This tool will convert an RPY replay file to CSV and then into new .LP files. This allows for easier editing of AI lines in a spreadsheet program. More information on the forum.

🔧.LP to .TXT & .TXT to .LP Converters (Ton Fastwalker)

These utilities can convert from .LP file format to an editable .TXT file, and back again.

🔧GPL .LP to ICR2 .LP Converter (Ton Fastwalker)

This program converts Grand Prix Legends .LP files to NASCAR Racing 3 and Indycar Racing 2CR2 format. It also creates the additional .LP files where needed. This tool is very useful for editors but might have a steep learning curve. Information can be found in the readme file inside the download.

---