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Open Source BIG Editor 0.583

Avatar of Banshee


Category: Modding Utilities
Created: Wednesday March 5, 2008 - 17:18
Updated: Saturday June 6, 2020 - 3:34
Views: 28132
Summary: A program to load, save and manage .meg files.


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2 votes

OS BIG Editor started as a .BIG file browser for Command & Conquer 3, Generals and Battle for Middle Earth games, but it has been expanded into a package editor, supporting the .meg files used by Petroglyph Games in games such as Star Wars: Empires at War, Universe at War, Grey Goo, 8-Bit Armies, etc.

The program features:

-> Load, save and edit .big and .meg files. (.BIG file can be saved with or without Refpack compression used on C&C3)
-> File extraction: You can extract files from these packages using the menu or dragging and dropping them into windows explorer.
-> File Addition: You can add files to your package through the menu (add directory) or dragging and dropping your files from windows explorer.
-> File reorganization: You can create new directories and move files internally, as well as editing file names and directory names in a very intuitive way. The program also allows you to delete files.
-> File preview: You can preview TGA, PNG, BMP and JPEG files straight in the program. The program also contains a binary browser and several options to optimize its usage. You can also open the files with the default program (for the file extension) or a pre-defined Notepad type of program, such as Notepad++ (recommended). Note that to use Notepad++ with all files, you need to hack the options.ini).
-> Multiples Languages: This version of the program has english and russian support, but you can add any language later as you wish.

User image

Note however that this is an unfinished version. This means that:

-> Real Time Edition feature is not working correctly. We heavly recommend you to uncheck it.
-> The program will have custom settings that will allow you to use programs to interpret certain file types or open certain files. This was not written yet.
-> Options was not worked on for ages and most of the options of the program are not changed in the preferences yet. However, the options.ini file can be read and edited by humans.
-> The graphics there are not the final version.
-> There is no documentation for the program done yet. The language files will be changed in the 0.6 release as well, to include the options and other things.
-> This is an emergencial release. The source code is not available in the package, but it is available at and future bug fixes and versions with new features will be available there.

Updated January 2015: It now opens End of Nations and Grey Goo .meg files. Exception for config.meg from these games.

Links / Downloads

Download OS BIG Editor 0.583 (Win32)1036June 6, 2020 - 3:09
Download OS BIG Editor 0.583 (Win64)16979March 5, 2008 - 17:23
Official Site: Project Perfect Mod (PPM)3602March 5, 2008 - 17:22
Official Program Support Forums at PPM3494March 5, 2008 - 17:22
EAW and UAW Support: Petrolution Forums3164March 5, 2008 - 17:21
OS BIG Editor SVN3377March 5, 2008 - 17:20


Gustavo HuffenbacherTPNGImage
Olaf Van Der SpekXCC's CRC32 code.
TSHyperAdditional graphics.
Siberian GRemlimRussian language
Alexander IonovAES decryption


Display order: Newest first

Banshee (Admin) - Saturday June 6, 2020 - 3:13

I've updated this program to support Grey Goo.


New update that should allow you to open Grey Goo's config.meg and 8-Bit Armies/Hordes/Invaders config.meg. Thanks Mike_nl to figure out how to do it and share with the rest of the community at his site:


With the release of C&C: Remastered Collection, we have got some feedback on how OS .BIG Editor handles the files there. And we have concluded that the previous releases of the program were incompatible with 32bits TGA files.

So, we have a new release of the OS .BIG Editor with the following features:

- A 64 Bits version of OS .BIG Editor has been released.
- Extract All window's size has been corrected.
- Creating a new directory when extracting files now updates the directory listing component at Extract All window.
- TGA reader from OS BIG Editor can now read 32 bits TGA files from C&C: Remastered Collection and other games properly.

So, that's it. Use this program to browse the .meg and .big files from this game (in this case, only .meg files) and many others games. Check the list of supported games here. And happy modding!

lycan - Friday March 7, 2008 - 10:13

A great program worth to download great work. Very Handy

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