Master of Orion II: Battle at Antares

From PCGamingWiki, the wiki about fixing PC games
Master of Orion II: Battle at Antares
Master of Orion II: Battle at Antares cover
Mac OS MacSoft
Release dates
DOS October 31, 1996
Mac OS (Classic) September 1997
Windows April 20, 2010[1]
macOS (OS X) November 29, 2012[2]
Linux May 12, 2015[3]
Master of Orion II: Battle at Antares guide at StrategyWiki
Master of Orion II: Battle at Antares at Wikipedia
Master of Orion
Master of Orion 1993
Master of Orion II: Battle at Antares 1996
Master of Orion III 2003
Master of Orion (2016) 2016

General information Orion Forums - Official forums, has a subsection for the original classics Community Discussions for game series Support Page
Steam Community Discussions
Realms Beyond - Has a subsection for the series (particularly the classics)
The Orion Nebula


Source DRM Notes Keys OS
Disc check (requires the CD/DVD in the drive to play)
Disc check can be removed by copying remaining files manually and editing the config files to point to the installation folder.[citation needed]
Mac OS
Also includes Master of Orion. Pre-packaged with DOSBox.[4]
macOS (OS X)
Icon overlay.png
Currently only available in bundles.

Version differences[edit]

Later updates of the game included a Windows 95 version of the executable, called Orion95.exe. This version was highly unoptimized though, particularly laggy when playing multiplayer games. Many don't consider this a true Windows version because of this.

Essential improvements[edit]

Run in DOSBox[edit]

To improve DOSBox performance make the following changes to the DOSBox configuration file:

  • Change core=auto to core=dynamic
  • Change cycles=auto to cycles=max


The latest official patch is version 1.31, which can be found here. There is also an unofficial 1.50.8 patch here (includes a windows-based launcher and optional mods). An older fan patch, 1.40, can be found here in-case 1.50 has something you don't like. Also note that the digital versions have 1.40 pre-installed, info for reverting which back to 1.31 can be found here. Additional patches/mods (possibly obsolete) can be found here, here, here and here.

Source ports[edit]

A reversed engineered source port is available.


Game data[edit]

In-game general settings.
In-game general settings.

Configuration file(s) location[edit]

System Location
Windows <path-to-game>\
Mac OS (Classic)
macOS (OS X)
Linux (Proton) <Steam-folder>/steamapps/compatdata/410980/pfx/[Note 1]
It's unknown whether this game follows the XDG Base Directory Specification on Linux. Please fill in this information.

Save game data location[edit]

System Location
Windows <path-to-game>\
Mac OS (Classic)
macOS (OS X)
Linux (Proton) <Steam-folder>/steamapps/compatdata/410980/pfx/[Note 1]

Save game cloud syncing[edit]

System Native Notes
GOG Galaxy
Steam Cloud

Video settings[edit]

Graphics settings ( version)
Graphics settings ( version)

Input settings[edit]

Keyboard and mouse Native Notes
For DOSBox use the DOSBox Mapper (see the glossary page for other workarounds).
Mouse acceleration
Mouse sensitivity
Mouse input in menus
Mouse Y-axis inversion
Controller support
For DOSBox use the DOSBox Mapper (see the glossary page for other workarounds).

Audio settings[edit]

In-game audio settings.
In-game audio settings.
Audio options Native Notes
Separate volume controls
Surround sound
Closed captions
Mute on focus lost
Windows 95 version only.


Language UI Audio Sub Notes
Fan translation, download


Multiplayer types

Type Native Players Notes
Local play
Hot seat
LAN play
8 Versus
Online play
8 Versus
Via DOSBox IPX tunneling.

Issues fixed[edit]

"The program can't start because DPLAY.dll is missing" error (Windows 95 version)[edit]

Even with the fix, the mouse cursor in-game will not render properly
Add dplay.dll to the installation folder and set up compatibility settings[citation needed]
  1. Go to %WINDIR%\SysWOW64
  2. Copy dplayx.dll and paste it into the game installation folder.
  3. Rename the copied file to dplay.dll
  4. Right click on the ORION95.EXE file and select "Properties".
  5. Go to the "Compatibility" tab and enable Compatibility Mode (set it to "Windows 98 / Windows ME"). Also check 256-color and 640x480 resolution.
  6. Run the ORION95.EXE file to play the game.

Corrupt graphics (Windows 95 version)[edit]

Use palette fix[5]

See Rainbow color problems in older games.

Mouse issues (Windows 95 version)[edit]

Download this (Windows 2000) or this (XP and later).

Other information[edit]


Technical specs Supported Notes
DOS video modes SVGA A VESA wrapper for the LOAD VESA.COM error can be found here.
64-bit executable

System requirements[edit]

A MoO2 total conversion for Distant World: Legends is also available here.
Minimum Recommended
Operating system (OS) 5 6.2
Processor (CPU) Intel 486 66 MHz Intel Pentium
System memory (RAM) 8 MB 16 MB
Hard disk drive (HDD) 330 MB
Video card (GPU) SVGA graphics card
Minimum Recommended
Operating system (OS) 95, 98 XP, Vista, 7, 8
Processor (CPU) 1 GHz 1.4 GHz
System memory (RAM) 256 MB 512 MB
Hard disk drive (HDD) 330 MB
Video card (GPU) DirectX 7 compatible DirectX 9 compatible
macOS (OS X)
Operating system (OS) 10.6.8
Processor (CPU) Intel Core Duo 2 GHz
System memory (RAM) 1 GB
Hard disk drive (HDD)
Video card (GPU) 64 MB of VRAM


  1. 1.0 1.1 File/folder structure within this directory reflects the path(s) listed for Windows and/or Steam game data (use Wine regedit to access Windows registry paths). Games with Steam Cloud support may store data in ~/.steam/steam/userdata/<user-id>/410980/ in addition to or instead of this directory. The app ID (410980) may differ in some cases. Treat backslashes as forward slashes. See the glossary page for details.