How to Open 001 Files

How to open 001 files or extract them with 7-zip. The following simple solution covers opening or extracting split files that use numbered extensions like .001, .002, .003, .004 etc. These archived files have been "split" by number into separate parts using a "file splitter".

Each numbered file contains only a part or piece of the whole program. In order for the application or program to work, the pieces or parts will need to be "joined" back together and then extracted using a "file joiner" tool.

In some cases, joining the parts will end up extracting an ISO or Bin file. In other cases, the pieces might end up making a directory of installation files for a program. Sometimes even containing the entire program in ready to run .exe "executable" form.

The main reason for splitting files is to conserve storage space. It is also worth mentioning that you cannot store a file larger than 4GB on a Fat32 filesystem. Making it necessary to split files that are beyond 4GB if they are to be stored on Fat 32.

Pro Tip: The file ending with the .001 extension contains all of the information that will open and "join" the rest of the .002, .003, .003, .004 files together, allowing its extraction.

What is a 001 file?

A file with a ".001" file extension is typically part of a split archive or compressed file set. These files are often created by file compression or archiving software, such as WinRAR, 7-Zip, or HJSplit, to split a large file into smaller parts. This can be useful for various purposes, such as distributing large files over the internet or fitting them onto multiple storage devices.

Here's how it typically works:

  • The original file is divided into multiple smaller parts, each with a ".001," ".002," ".003," and so on, file extension. For example, if you have a file named "example.rar," it might be split into "example.001," "example.002," "example.003," and so forth.
  • To extract the original file, you need all the parts. Most archive software will recognize these numbered parts and allow you to extract the content back into a single file.
  • You usually only need to open or extract the ".001" file (the first part), and the software will automatically locate and use the other parts if they are in the same directory.
  • Once all parts are present, the software will combine them to recreate the original file.

Keep in mind that ".001" files are not a standard file format like ".zip" or ".rar"; they are part of a split archive created by specific archiving tools. To work with these files, you'll need compatible software that can handle split archives and extract the contents.

How to open 001 files with 7-zip

You can use 7 Zip, a well known free archiver tool to open 001 files, so that the contents can be extracted. Here's how:

  1. Download 7 Zip and then launch 7z####.exe to start the program.
  2. Browse to your file ending with the .001 extension.
  3. Right click on the file and choose 7-Zip > Extract Here
    Open 001 files - Extract 001 files with 7 Zip
  4. The contents will be extracted to the same directory that contains the .001 - .009 parts. All of the files from that archive should now be joined, merged, or combined to form the original program.

If the program was originally an ISO, you may end up with a .bin and a .cue file, you can then create a CD/DVD from the .bin file using your favorite CD/DVD creation software.

Note: 7z can be used to both join files (extract 001 files) or split files.

Open or rejoin .001 files using HJSplit

To open 001 files using the HJ-Split file joiner tool:

  1. Download HJSplit and unzip and launch the executable.
  2. Select "Join" Mode: In HJSplit, you have two main modes: "Split" and "Join." To rejoin the ".001" files, click on the "Join" button.
  3. Choose the Input File (.001): In the "File" section of the Join mode, click the "Input File" button. Navigate to the folder where your ".001" file is located, and select the first part with the ".001" extension (e.g., "example.001"). This file contains information about the split archive and will be used to locate and rejoin the other parts.
  4. Choose the Output Location: In the "Output File" section, click the "..." button to choose the location and name for the reassembled file. Make sure you specify a new name and location for the joined file.
  5. Start Joining: Once you've selected the input file and specified the output location, click the "Start" button. HJSplit will start the process of rejoining the split archive.
  6. Wait for Completion: HJSplit will analyze the input file and locate the other parts (e.g., "example.002," "example.003," etc.) in the same folder. It will then rejoin them into a single file. Wait for the process to complete.
  7. Confirmation: Once the process is finished, you should see a message indicating that the joining operation was successful.
  8. Access the Rejoined File: You can now access the reassembled file in the specified output location you chose earlier.

HJ-Split is a straightforward tool for joining split archive files like ".001" files. It's important to have all the parts in the same folder, and the software will automatically recognize and combine them into the original file. This concludes how you open 001 files!