ATT File Type

- The quick facts

What are ATT files and how to open them

Are you having problems opening an ATT file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is an ATT file?

The .att file extension is most commonly associated with Web Form Post data files. These files are created when a visitor to a website uses a Web form to submit information in a Web browser. The ATT files contain the contents of the Web form. The ATT file is emailed to the recipient that has been designated by the Web programmer and is attached to the email with the .att file extension.

The .att file extension is also used for AT&T Group 4 bitmap graphic files, Alphacam lathe tool files, SeeYou waypoint files and ZipLip secure e-mail files.

How to open ATT files

Important: Different programs may use files with the ATT file extension for different purposes, so unless you are sure which format your ATT file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested 7 different ATT openers which you will find listed below.

Last updated: July 13, 2020

Suggest another file format using extension ATT

While we know of one file format using the .ATT file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .ATT file.

Various apps that use files with this extension

These apps are known to open certain types of ATT files. Remember, different programs may use ATT files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Dialog Semiconductor AudioTuningToolDialog Semiconductor AudioTuningToolUser submitted
Genero StudioGenero StudioUser submitted
Accounts ViewerAccounts ViewerUser submitted
IBS AttestIBS AttestUser submitted
Satmaster ProSatmaster ProUser submitted
Post Data SpiderPost Data SpiderUser submitted
HiJaak ApplicationHiJaak ApplicationUser submitted
We have not verified any software that we know for certain will work with ATT-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with ATT-files. If you know one, please use the 'Suggest a program' link below and tell us about it!