What is a .MAR File And How To Open It – Mariner Software (Simple Steps)

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Have you downloaded a file with .mar extension, but you have never seen this extension before? It is important to know how to open this file – in order to be able to work with it. Fear not, in this article we will show you how to easily open the .mar file in few simple steps on various systems.

What is a .MAR file?

The .MAR file extension is Mariner Calc Spreadsheet. The development of this file was done by Mariner Software. This spreadsheet related file is in binary format.

What to know

There is currently 1 software that can open the .mar file on 1 platform.

How to open a .MAR file?

Below we have written a comprehensive guide on how to open the .MAR file on various operating systems.

How to open a .MAR file on Mac

Below you can see a visual guide on how to open the .mar file on Mac in 4 easy steps.

1. In the first step you need to download the Mariner Calc XLS software. This software will be used for opening the file.

Step 2

Step 2: Finding your .MAR file

2. The second step is locating the downloaded file. The file can be usually found in your /download/ folder if you don’t remember where you have downloaded it to.

Step 3

Step 3: Clicking “Open with”

3. In the third step, after locating your file, right click on it and click “Open with”.

Step 4

Step 4: Choosing the software to open your file

4. In the fourth step, after clicking “Open with”, you should see the Mariner Calc XLS software that you have downloaded. Choose your software and click on “OK”. Congratulations! You have opened your file on Mac.

Still cannot open the .MAR file?

If you are still unable to open the .MAR file, it might be because you are trying to open the wrong one. The .MAR file extension is similar to other file extensions such as: .mar – Mozilla, .mar – Microsoft. You might be trying to open the wrong file, please recheck if you are trying to open the right file extension again.


In this article you have learned how to open the .MAR file with the Mariner Calc XLS program on Mac.