.MAR File Extension

There are 3 file types use the .MAR file extension:

  1. Microsoft Access Report
  2. Mozilla Archive
  3. Mariner Calc Spreadsheet

1. Microsoft Access Report

Microsoft Access Report

Shortcut file created by Microsoft Access, a relational database program for the desktop computer; contains a link to a report in an Access database; can be created by dragging a report object to the desktop and can be opened by double-clicking the file.

Software's name License Platforms
Microsoft Access Microsoft Access Commercial Windows

Updated: September 1, 2011

2. Mozilla Archive

Mozilla Archive

Application update file used by Mozilla programs such as Firefox, Thunderbird, and SeaMonkey; contains files that update the program to a new version; run by the Mozilla update program (update.exe in Windows), which is included with Mozilla software installations; stored in a custom file format, but Mozilla has made the specification publically available.

Mozilla programs automatically download and run MAR files, so the typical user will never manually open a MAR file. However, MAR files can be used to manually update a Mozilla program without opening it, which can be useful for system administrators.

The Mozilla development team generates nightly builds for their software products that include a MAR update package. Therefore, users can apply software updates with the latest release each day.

NOTE: MAR files created by the Mozilla team use the filename convention [program]-[version].complete.mar and [program]-[version].parial.mar for complete and partial software updates.

Software's name License Platforms
Mozilla Firefox Mozilla Firefox Open Source AndroidChrome OSiOSLinuxMacWebWindows
Mozilla SeaMonkey Mozilla SeaMonkey Open Source LinuxMacWindows
Mozilla Thunderbird Mozilla Thunderbird Freeware LinuxMacWindows

Updated: December 1, 2011

3. Mariner Calc Spreadsheet

Mariner Calc Spreadsheet

Spreadsheet created with Mariner Calc, a lightweight spreadsheet application for Mac OS X; contains data organized into rows and columns; supports functions, charts, named ranges, sorting, and auto-summation.

MAR files are saved in a proprietary format that can only be opened with Mariner Calc.

Software's name License Platforms
Mariner Calc XLS Mariner Calc XLS Paid Mac

Updated: April 2, 2015

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