If you are seeking information about file extensions, then you are in the right place at the right time.

Details of extension .mpu

On this page, we're going to take a closer look at the .mpu file extension, which is related to Mail.dat Mail Piece Unit File.

We'll explain what exactly a .mpu file format is and how you can use it. If you're interested in learning more details about this type of file, we'll show you where to find them. And if you ever need to convert .mpu files into different formats, we'll give you some tips on how to do that too.

Let's see the file format associated with this file extension!


  1. Mail.dat Mail Piece Unit File

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Mail.dat Mail Piece Unit File

mpu file - Mail.dat Mail Piece Unit File
The MPU file belongs to the Data category and works with PostalOne!, being used as a Mail.dat Mail Piece Unit File. Mail.dat is the standard embraced by a significant portion of the mail production industry and the US Postal Service. Mail.dat is a relational database of nineteen "connected" files describing each characteristic that can exist within a mailing. The developer is still actively supporting the PostalOne!, likely. Our data shows that PostalOne! uses 17 more file types.
Application: PostalOne!
Program name: -
Category: Data files
Mime-type: application/octet-stream
Related extensions:
.cpt Mail.dat Component File
.iak Mail.dat Information Access Key
.hdr Mail.dat Header File
.csm Mail.dat Container Summary File

The .mpu file extension might not only belong to a single type of file, there could be various kinds that use it. Keep in mind that files with the .mpu extension may contain various content types. If you have helpful information about this extension, write to us!

Could someone have spelled the .mpu file extension wrong?

In our database, we came across the following similar extensions:

.mu Quattro Pro for DOS Menu Data
.mpi InstallJammer Project
.lpu SDL Passolo Localization Project
.mpy RCA Lyra Audio File
.mp MatrixPlot Data
.mpk ArcGIS Desktop Map Package

The .mpu extension is frequently misused

People sometimes confuse the .mpu filename extension. Based on the searches on our site, here are the most common misspellings from the past year.

mu (1), mpi (1), lpu (1), mpy (1), mp (1), mpk (1), pmu (1), kpu (1), mup (1), mpj (1)

Having trouble opening a .mpu file?

If you want to open a .mpu file on your computer, you just need to have the appropriate program installed. Incorrect settings for the .mpu association can trigger this error.

Windows can't open this file:

File: example.mpu

To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program with which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2016/2019/2022, Windows 7, Windows 8, Windows 10, Windows 11, Linux, Mac OS X, macOS, iOS, Android