Windows Registry backup file
File type: Backup file
Files with da1 extension are known as registry backup files.
Found 2 different file type records with the same da1 filename suffix.
File type category:
Backup file
Date updated: December 30, 2024
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.
Software apps that backup da1 files:
Microsoft Windows
File type category:
Game file
Date updated: November 4, 2026
Star Trek Generations is a computer game developed by MicroProse. It combines first-person shooter gameplay with adventure and strategy elements and is based on the film of the same name.
The DA1 file format stores a saved game for Star Trek Generations. It is a legacy format associated with the Windows version of the game and is not intended for general-purpose use outside the game.
Open a DA1 file by loading it from within Star Trek Generations on Microsoft Windows. The file is a saved game backup intended to be used by the game rather than opened as a document in another application.
DA1 files cannot be meaningfully converted to another format. To use the saved progress, keep the file in the location used by Star Trek Generations and load it from the game.
Software apps that backup da1 files:
Microsoft Windows
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