There is one other file type using
the DA1 file extension!

empty icon.da1 - Star Trek Generations Saved game file format

Detailed description

Software that works with da1 file extension

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DA1 file extension - Windows Registry backup file

What is da1 file? How to open da1 files?

File type specification:

Backup file type icon Backup file type

The DA1 file extension is used for Microsoft Windows Registry backup files since the times of Windows 95. The *.da1 file is probably a backup file of some .dat file, perhaps only with the file extension renamed.

The default software associated to da1 file type:

Microsoft Windows icon

Microsoft Corporation logoMicrosoft Windows  Microsoft Windows software

Company or developer:
Microsoft Corporation

A family of operating systems developed by the Microsoft Corp. The first Windows was released in 1985 as a GUI add-on to MS-DOS.  MS-DOS based Windows versions were developed to 2000, when was released the last version called Windows ME. Windows based on NT core started in 1993. Windows NT family are developed to these days, the latest version is called Windows 10.

Help how to open DA1 files:

Currently there is no specific information available, about how to open this file extension.
For general information try to look at:
Basic info how to open backup files

How to convert file with extension DA1:

Currently there is no specific information available.
For general information try to look at:
Basic info how to convert backup files

List of recommended software applications associated to the .da1 file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux etc.) and possible program actions
that can be done with the file
: like open da1 file, edit da1 file, convert da1 file, view da1 file, play da1 file etc. (if exist software for corresponding action in's database).

  • Backup da1 file

Software that backup da1 file - Windows Registry backup file

Click on the link to get more information about Microsoft Windows for backup da1 file action.

Microsoft Windows:

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