ATT file: How can I open a .ATT file?
The table below provides useful information about the .att file extension. It answers questions such as:
- What is the .att file?
- What program do I need to open a .att file?
- How can the .att file be opened, edited or printed?
- How can I convert .att files to another format?
We hope you find this page helpful and a valuable resource.
✅ AT&T Group 4 Bitmap Image

The ATT file is an AT&T Group 4 Bitmap Image.
✅ Alphacam Lathe Tool Data

The ATT file is an Alphacam Lathe Tool Data. Alphacam is a leading CAD/CAM software solution for the Woodworking industry.
✅ ZipLip Secured E-mail Message

The ATT file is a ZipLip Secured E-mail Message. ZipLip is a program used to encrypt/decrypt email messages on the fly.
⚠ Be careful with .att files.
It's important to know that the .att file extension can be used by various programs, not just the ones you expect. This includes potentially harmful software or malware that might create .att files. Be cautious when dealing with .att files from unknown sources.
🔄 .att converters
The following softwares are capable of converting .att files to other formats:
For example, using the softwares above, a .att file can be converted into one of the following formats:
🚫 The .att file extension is often given incorrectly!
According to the searches on our site, these misspellings were the most common in the past year:
Is it possible that the filename extension is misspelled?
We found the following similar file extensions in our database:
🔴 Can't open a .att file?
When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:
Select an app to open this .att file
It means that the operating system does not have a default app associated with the .att file type. To resolve this issue and open the file, you can take the following steps:
- Right-click on the .att file. A context menu will appear.
- From the context menu, select Open with. Windows will display a list of recommended apps.
- If the desired app is listed, select it from the provided options.
- If you cannot find the appropriate app, you may need to install software that supports the specific file type.
If you don't know how to change the default app for the .att file, check the FAQ.
🔴 Can I change the extension of files?
Changing the filename extension of a file is not a good idea. The extension of a file serves as a hint to the operating system and various software programs about the type of data contained within the file. When you alter a file's extension, you essentially modify how software applications interpret and handle that file. Every file has a specific format, also known as its file type or file format. The problem is, changing the file extension does not change the file format.
If you have helpful information about the .att file extension, write to us.