ATT00001 file format description

Many people often share .att00001 files without providing instructions on how to use them. This can make it difficult for users to determine which program is compatible for editing, converting, or printing .att00001 files. To address this issue, we have created this page to offer assistance and guidance on handling .att00001 files. We provide information on compatible software, editing instructions and conversion options to help users effectively interact with .att00001 files.

Our aim is to simplify the process and promote seamless use of the .att00001 file format.

1 filename extension(s) found in our database.

.att00001 - Microsoft Exchange Generic Attachment Data

The ATT00001 data files are related to Microsoft Exchange Server. The ATT00001 file is a Microsoft Exchange Generic Attachment Data. Microsoft Exchange Server is a mail server and calendaring server developed by Microsoft. It runs exclusively on Windows Server operating systems.

Microsoft Exchange Server
Data files
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Microsoft Exchange Generic Attachment Data related extensions:
Microsoft OneNote Binary Data
Microsoft Dynamics NAV Object Container
Microsoft Word Exclude Dictionary
Microsoft Entourage 2008 Note Data
Microsoft Office for Mac Help Data
Microsoft Windows Installer Data

Naturally, other applications may also use the .att00001 file extension. Even harmful programs can create .att00001 files. Be especially cautious with .att00001 files coming from an unknown source!

Can't open a .att00001 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:

Windows can't open this file:


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 one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

Operating systems

At, we strive to provide a seamless user experience by ensuring compatibility with a wide range of operating systems. The following is a comprehensive list of the operating systems currently supported by

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

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