.MAR File Extension

File Type 1

Mozilla Archive

Developer Mozilla
3.5  |  21 Votes
Category Misc Files
Format Binary

What is a MAR file?

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.

More Information

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.

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Programs that open MAR files

Updated November 1, 2011
File Type 2

Microsoft Access Report

Developer Microsoft
4.3  |  4 Votes
Category Database Files
Format N/A

What is a MAR file?

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.

Programs that open MAR files

Updated March 28, 2011
File Type 3

Mariner Calc Spreadsheet

Developer Mariner Software
3.5  |  2 Votes
Category Spreadsheet Files
Format Binary

What is a MAR file?

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.

More Information

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

Programs that open MAR files

Updated June 4, 2015

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