001 File

What are 001 files and how to open them

Are you having problems opening a 001 file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your 001 files.

What is a 001 file?

001 files have multiple uses, and 7-Zip Split Archive is one of them. Read more about the other uses further down the page.

7-Zip Split Archive File

A file with the 001 file extension is often the first file in a set of multi-volume archive files created by 7-Zip. These files are similar to ZIP files; they contain multiple files that have been compressed (reduced in size) to save storage space and bandwidth.

When you create an archive file, 7-Zip lets you set a "volume size", which lets you split the output file into several files of the same size. This is useful if you know the output file will be huge, and you want to store it on, e.g., CD, DVD, or floppy disks for backup purposes.

Each file is given a number as the file extension, starting with 001 for the first file. All part files are needed to extract the content of the file archive. Start by opening the file with file extension 001, and your archiving tool will automatically prompt for the next volume as it decompresses the archive.

How to open 001 files

We have identified three 001 openers that are compatible with this specific type of 001 file.

Programs that open 7-Zip Split Archive files

Last updated: August 14, 2026

All known file formats using extension .001

While 7-Zip Split Archive File is a popular type of 001-file, we know of 8 different uses of the .001 file extension. Different software may use files with the same extension for different types of data.

Central Point Backup Data

Another use of file extension 001 is for backup files created by the old CP Backup software by Central Point Software.

This software is long obsolete and was acquired by Symantec in 1994.

While we have not verified the apps ourselves yet, our users have suggested four different 001 openers which you will find listed below.

Norton Backup File

Another program that used the 001 file extension was the old Norton Backup software for MS-DOS. It used 001 for the first data disk, 002 for the next, etc.

We're unsure if any of Norton's current offerings can restore these files, but we doubt it.

You usually do not need to edit or view these files, as they only contain information usable by the software program that uses them.

DoubleSpace Compressed Disk Volume

DoubleSpace was a compression technology used in MS-DOS and Windows 95, 98, and ME, which allowed the user to compress all data on a hard drive. At the time, hard drive size was limited and expensive, and this software solution that could help stuff more data onto hard drives by compressing it on-the-fly was popular.

The hard drive content was stored in a file with file extension 001. The DoubleSpace device driver was loaded at boot time and ensured all hard disk interaction by the operating system was intercepted and directed to this single compressed file.

You are only likely to come across this type of 001 files if you work with legacy hardware and old systems preservation.

You usually do not need to edit or view these files, as they only contain information usable by the software program that uses them.

Chompsters Level Data

We know that one 001 format is Chompsters Level Data. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

GLAMUS DOB-Structure

GLAMUS DOB-Structure files are a type of proprietary data file created by Glamus Gesellschaft für Moderne Kommunikation GmbH. These files store a custom "DOB-Structure" data container format used internally by Glamus software to hold structured data under the label "DOB-Structure (c)9 by GLAMUS." They are written by Glamus tools and intended for use only within the Glamus software environment.

A DOB-Structure file typically contains hierarchical or structured data blocks, likely representing configuration, layout, or project data, which Glamus software reads in order to load or resume work. These files are not intended to be directly edited by users; they are output by Glamus programs and consumed by the same to interpret settings or structure definitions relevant to Glamus's functionality.

Files begin with a distinct byte signature at the start: ASCII text "\n\rDOB-Structure(c)9" at offset 0, followed by " by GLAMUS" near offset 21. The content includes the string "BY GLAMUS," which identifies the vendor.

SCUMM Main Data Container

SCUMM Main Data Container files (extension .001) are the core resource files used by LucasArts games that run on SCUMM version 6. These files, sometimes called Main Data File, store nearly all of the game's content except the executable, audio tracks, and certain index files. The data includes rooms (scenes), global scripts, sounds and voice data, character costumes and animations, user interface fonts, text strings, object definitions, and anything the game needs to present graphics, text, and scripted behavior to the player.

These .001 files are created by the game's build process (using SCUMM or its companion tools) and shipped as part of the game's data on disk or CD. To play the game, an interpreter - such as ScummVM - reads this .001 file at runtime, uses the file's internal indices to locate resources by ID, and renders rooms, runs game scripts, loads graphics, audio, and fonts as directed. Users will often find one .001 file per game (or more in case of expanded or enhanced editions), alongside other files like executables, localization files, and sometimes disc audio tracks; the .001 file is essential for the game's interactive content.

Internally the file begins with a container block tagged LECF (ASCII bytes 0x4C 0x45 0x43 0x46 at offset 0) that identifies it as a SCUMM main data container version 6.

Veeco D3100 Data

Veeco D3100 Data files with extensions .001, .002, .003 store raw surface height measurements from a Veeco Dimension 3100 scanning probe microscope. They are created by Veeco's Dimension software when capturing topography data. Each file corresponds to one image or channel of probe data and is used in atomic force microscopy (AFM) workflows. Processing, analysing or visualising these files generally requires specialised SPM software that understands Veeco's raw binary format, often converting them into more accessible images or data matrices.

These files are produced directly by the Dimension 3100 instrument during measurement, when you initiate a scan in the controlling software. They represent the unprocessed output in binary form, containing a grid of height values over the scanned area with parameters like lateral dimensions, pixel count, and voltage or height units encoded in headers. After capture, users typically open them with Veeco (now Bruker) analysis software or third-party tools like Gwyddion to view, flatten, remove noise, and export surfaces or profiles for further analysis.

The format is identified by the first four bytes at offset 0 having the signature 5C 26 14 00. Files may span multiple extensions (.001, .002, .003) for different channels or scan directions. The known importer in the open-source tool Gwyddion refers to this format as dimensionfile.c and labels it "Veeco Dimension 3100D .001, .002, etc." confirming support for reading them.

Various apps that use files with this extension

These apps are known to open certain types of 001 files. Remember, different programs may use 001 files for different purposes, so you may need to try out a few of them to be able to open your specific file.

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