.001 File Extension
Split Archive Part 1
| Developer | N/A |
| Popularity |
4.0 | 284 Votes |
What is a 001 file?
A 001 file is the first part of a split archive. Several file archiving and splitting utilities can create 001 files, while dividing large archives into smaller pieces. A split archive's other pieces are usually saved in similarly-named files that use the .002, .003, .004, and so on extensions. You must possess all of a split archive's pieces to access the file(s) it contains.
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When an archive has a large file size (e.g. because it contains hundreds or thousands of files), users may choose to split that archive into several smaller pieces, to make it easier to store and share with others. For example, a user who cannot email a large .ZIP archive may split that archive into several smaller files that they can then email.
These split archives are often saved as a set of files that use the .001, .002, .003, etc. extensions. A split archive's 001 file typically contains identifying metadata that file archiving and joining utilities use to extract files from or reconstitute the split archive. However, to successfully extract files from or stitch together a split archive, you usually must possess all of that split archive's constituent files, not just its 001 file.
NOTE: Some archive utilities produce split archive files that use compound file extensions. For example, 7-Zip's split archives use the .7Z.001, .7Z.002, and so on extensions.
How to open a 001 file
Several archive utilities allow you to extract files from 001 files, provided you possess all the other pieces of the split archive. For example, in 7-Zip (Windows), you can right-click a 001 file and select 7-Zip → Extract Here to extract the files a split archive contains. Before doing so, be sure that:
- You have every part of the split archive.
- You've stored all the parts in the same directory as the 001 file.
If you're having trouble extracting files from a split archive, it's possible that your archive utility does not support that split archive's format, or that you do not have every piece of the split archive. In these cases, you may want to try using a different archive utility and/or verify that you have all the pieces of your split archive.
Programs that open or reference 001 files
Norton Ghost Disk Backup
| Developer | Symantec |
| Popularity |
3.4 | 70 Votes |
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.
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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 001 files
Multimedia Fusion Backup File
| Developer | Clickteam |
| Popularity |
3.4 | 29 Votes |
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.
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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 001 files
Fax File
| Developer | N/A |
| Popularity |
3.3 | 29 Votes |
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 001 files
Snes9x Slot 2 Saved State
| Developer | The Snes9x Team |
| Popularity |
3.1 | 22 Votes |
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.
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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.