The File Extensions Database

.001 File Extension

  • Category: Backup Files
  • Format: Binary

What is an .001 file?

.001 is Split Archive File

A 001 file is the first file of a split archive created with various file splitting and joining utilities. It is used to split large archives into smaller, more manageable files. 001 files can be used for saving files onto multiple storage devices, such as USB drives or CDs, or for creating smaller email attachments.

An 001 file is one part of a larger archive, which means there is at least one more split archive associated with the file. Each part of a split archive is given an ascending number extension, which are .002, .003, etc.

NOTE: Programs such as 7-Zip use compound extensions for split archives. For example, 7-Zip creates split archives with the .7Z.001, .7Z.002, etc. extensions.

Programs that open Split Archive File
Smith Micro StuffIt Deluxe for Windows
Welltek 001 File Joiner & Splitter
Freebyte HJSplit for Java
Freebyte HJSplit
OO1 File Manager
Smith Micro StuffIt Deluxe 16
Freebyte HJSplit for Java
Split & Concat
Incredible Bee Archiver
Freebyte HJSplit for Java
Freebyte HJSplit for Linux
File Type 2:

Norton Ghost Disk Backup

Developer by: Symantec Category: Backup Files

Backup of a hard disk created with Norton Ghost; created when a backup is split into multiple files due to the 2GB file size limit in DOS; other parts of the split backup have extensions ".002," ".003," etc.

Split backups created with Norton Ghost also include a .GHO file, which contains information about the backup files and is necessary for restoring the backup.

NOTE: Norton Ghost was renamed as Ghost Solution Suite.

Programs that open Norton Ghost Disk Backup
Symantec Ghost Solution Suite
File Type 3:

Multimedia Fusion Backup File

Developer by: Clickteam Category: Developer Files

Backup of a project (.MFA) file created with Multimedia Fusion, a game development program; generated by the program's Autobackup feature; allows the project to be restored in case the original file becomes corrupted or is accidentally deleted.

NOTE: Multimedia Fusion may create multiple backup files with the extensions ".001," ".002," etc, depending on how many backup copies have been selected in the program preferences.

Programs that open Multimedia Fusion Backup File
Clickteam Multimedia Fusion
File Type 4:

Fax File

Category: Raster Image Files Format: Binary

Fax image file created by various fax devices and software programs; may contain the image of the first page of a multi-page fax, while subsequent pages use the extension ".002," ".003," etc.; used to store the image data from received faxes.

Programs that open Fax File
j2 Global Communications eFax
j2 Global Communications eFax
j2 Global Communications eFax
File Type 5:

Snes9x Slot 2 Saved State

Developer by: The Snes9x Team Category: Game Files Format: Binary

Saved game state created by Snes9x, a Super Nintendo Entertainment System (SNES) emulator; contains a game snapshot saved in the second of nine slots (slots 1-9); used to save and load SNES emulated game states.

Saved game slots 1-9 correspond to file extensions ".000" through ".009" on the Windows version of Snes9x. Their files are named using the ROM name followed by the respective slot extension. For example, GameA slot 2 would be named GameA.001.

Saved states are stored in the Saves directory of an Snes9x installation. On Mac versions of Snes9x, saved states use the the extension .FRZ ("frozen" states).

NOTE: Unlike a normal game saved state, which may only be created at certain points in the game, 001 files can be created at any time during gameplay.

Programs that open Snes9x Slot 2 Saved State

How to solve problems with 001 files

  • Associate the 001 file extension with the correct application. On :
    Windows: Right click on any 001 file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.001 files". Mac: Right click (or Ctrl-click) the 001 file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .001 is Split Archive File. Because only the current version supports the latest 001 file format. Search, therefore, e.g. on the N/A manufacturer website after an available .001 is Split Archive File update.
  • To make sure that your 001 file is not corrupted or virus-infected, get the file again and scan it with antivirus software.