Opening a MAS File

The MAS file type is primarily associated with rFactor.

MAS	File extension: MAS
	File type:	archive

What is a MAS file?

MAS files mostly belong to rFactor. Your MAS file can belong to several types of data, depending on its source.
For example, many MAS files are used in racing simulation games.

Game Archives: Some files are used as game archives for titles like rFactor and rFactor 2. They store images, 3D models, and game data. Check the assets via the rFactor download page or the rFactor 2 website.
Racing Game Data: Other files serve as archives for F1 Challenge (also known as Cube Formula One game archives) and can be linked with similar titles.
3D Model Archives: Certain MAS files are used in games like Age of Empires to keep 3D model data. Visit the official site at Age of Empires for details.
Bioinformatics: There are files used for multiple sequence alignments, commonly handled by the MEGA system. More info can be found at MEGA.
Code and Metadata: A few MAS files hold MARIE assembly language code or store metadata for data integration. These text-based files can be opened with a text editor if you suspect they are not game data.
Market Data: Some versions serve as Market Activity Summary files for proprietary financial data systems.

Opening and Viewing:
The correct approach is to first check the file's origin. If it comes from a game installation, use that game's client or asset editor. For bioinformatics or code files, a plain text editor or the proper analysis software should work.
FilExt.com note: Because the same "MAS" extension is used by different systems, knowing the file's context is key to opening it properly.

How to open MAS files

You need a suitable software like rFactor to open a MAS file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your MAS file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a MAS file directly in the browser:. Just drag the file onto this browser window and drop it.

Online MAS Text Viewer

Choose your .mas file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert MAS files:

rFactor
See the previous paragraphs to learn more about the main application. MAS files are often referred to as rFactor games because this type of file is primarily created or used by this software.
Access (Stored Procedures) by Microsoft Corporation
Program ID is Access.Shortcut.StoredProcedure.1
Focus Master Data Definition
Freelance Graphics (Smartmaster File) by IBM
This was a Lotus product. Lotus was bought out by IBM. The Mime types used with this association are: application/vnd.lotus-freelance, application/x-freelance.
Make A Storybook (Storybook) by Kennard Consulting
The site makeastorybook.com is an on-line application that lets you create, personalize and print your own storybook. Change the characters' names, what they look like, what happens in the story...everything. The .MAS file contains information about the characters, scenes and storyline for a storybook created using makeastorybook.com. The Mime types used with this association are: text/makeastorybook. This file format is classified as Text.
Nascar
The identifying characters used for this association are - Hex: 43 55 42 45 4D 41 53 34 2E 31 30, ASCII: CUBEMAS4.10.
QuickCard File
WebFOCUS / FOCUS / Web390 (MASter File Description (MFD)) by Information Builders
.MAS is a text file based metadata component, that describes the physical attributes of a database table (column names, column sizes, column format, etc) read via WebFOCUS, FOCUS, and Web390 product engines. This file format is classified as Database.

MAS file format:

To find out what program is needed to open MAS files, you need to determine the file format. A file format is determined by the file extension and signature, so JPEG images have the extension .jpg and the first bytes in the file are ÿØÿ. File extension, signature and file format must match; otherwise errors will occur when the file is opened. So you need a detailed analysis of a file to find out the format and the associated program. In the following you will find our evaluation of the MAS files:

The MAS file ending includes many different file formats. But the following two file formats are common:

15% of all MAS files belong to NASCAR SimRacing game data archive. The contents of these files cannot be read by a human; only a computer program can interpret the data. The files are 100 KB to 5 MB in size, with a median of 1 MB. This file type was primarily in use more than 10 years ago. Certain words are almost always found in the files, such as CUBEMAS4.10. The file name Team.mas or Drivers.mas is characteristic of these files. Files like these have the following tags: ingame.
10% of all MAS files are ISI gMotor MAS type 1 game data archive files. These are binary files, so they do not contain words or text. MAS files can be up to 34 MB in size, but are often around 1 MB - 21 MB.

All the rest of the MAS files (75%) have different formats, often e.g. UTF-8, FILENAME and MAS. The category is cases, alignment, teams, newmain, cmaps, nsefo or texas. If you want to find out what your MAS file contains, drag and drop it onto this page.

Technical Data for MAS File Extension

File classification:

Game

Identifier:

Hex: 43 55 42 45 4D 41 53 34 2E 31 30, ASCII: CUBEMAS4.10 (provided by TrID database)

Related files:

pk3, mdl, asm, maas, veh, mass, acx, cwr, hdv, zip, fex, gen, csi, pak, dat, cfg, txt

Mime type:

application/octet-stream, application/vnd.lotus-freelance

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: Access.Shortcut.StoredProcedure.1
EXEFile: %ProgramFiles%\Archivos comunes\Microsoft Shared\Access Runtime\Office10\MSACCESS.EXE /NOSTARTUP /SHELLSYSTEM [OpenStoredProcedure %1]

ProgramID: Access.Shortcut.StoredProcedure.1
EXEFile: %ProgramFiles%\Microsoft Office\Office10\MSACCESS.EXE /NOSTARTUP /SHELLSYSTEM [OpenStoredProcedure %1]

ProgramID: Access.Shortcut.StoredProcedure.1
EXEFile: %ProgramFiles%\Microsoft Office\OFFICE11\MSACCESS.EXE /NOSTARTUP /SHELLSYSTEM [OpenStoredProcedure %1]

ProgramID: Access.Shortcut.StoredProcedure.1
EXEFile: %ProgramFiles%\Microsoft Office\Office\MSACCESS.EXE /NOSTARTUP /SHELLSYSTEM [OpenStoredProcedure %1]

ProgramID: Access.Shortcut.StoredProcedure.1
EXEFile: %ProgramFiles%\OfficeXP\Office10\MSACCESS.EXE /NOSTARTUP /SHELLSYSTEM [OpenStoredProcedure %1]

ProgramID: Access.Shortcut.StoredProcedure.1
EXEFile: W:\OfficeXP\FILES\PFILES\MSOFFICE\OFFICE10\MSACCESS.EXE

ProgramID: FLW3Master
EXEFile: c:\lotus\flg\f32main.exe %1

ProgramID: Access.Shortcut.StoredProcedure.1
EXEFile: %ProgramFiles%\Microsoft Office 2007\Office12\MSACCESS.EXE /NOSTARTUP /SHELLSYSTEM [OpenStoredProcedure]

ProgramID: Access.Shortcut.StoredProcedure.1
EXEFile: %ProgramFiles%\Microsoft Office2007\Office12\MSACCESS.EXE /NOSTARTUP /SHELLSYSTEM [OpenStoredProcedure]

ProgramID: FLW3Master
EXEFile: %ProgramFiles%\lotus\flg\f32main.exe

ProgramID: Access.Shortcut.StoredProcedure.1
EXEFile: %ProgramFiles%\Microsoft Office\Art\Office10\MSACCESS.EXE /NOSTARTUP /SHELLSYSTEM [OpenStoredProcedure]

Show all 11 listings To Top

a mas archive is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with MAS files

Associate the MAS file extension with the correct application.
Update your software that should actually open archives. Because only the current version supports the latest MAS file format. Search, therefore, e.g. on the manufacturer website after an available rFactor update.
To make sure that your MAS file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .MAS file online - secure, fast, and no downloads needed.