Files with att extension are mainly related to Web Form Data file format that contains data from online webpage javascript in a text format.
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.ATT file extension - Web Form Data
What is att file? How to open att files?
File extension att is used for files that contain data from an online webpage javascript form, normally from an older or basic web input form which utilizes email through the browser.
Windows can usually open the file and/or it can be read and edited using a simple text software such as Notepad.
att files are in plain text file format and can be usually found as email attachments, such as postdata.att file.
Updated: December 31, 2024
The default software associated to open att file:
Post Data Spider 
(obsolete software)
Company or developer:
Giuseppe Buttafuoco
Post Data Spider is an older program used to decode data from attachments and online forms.
List of software applications associated to the .att file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open att file, edit att file, convert att file, view att file, play att file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting att files.
Software that open att file - Web Form Data
Programs supporting the exension att on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open att file action.
Microsoft Windows:
Main software associated with att file by default:
Post Data Spider (obsolete/discontinued)
Other suggested software:
NotePad++ text editor
Microsoft Windows NotePad
PSPad
Sublime Text
