How to Open 001 files or extract 001 files with 7-Zip or HJSplit file joiner. If you've come across files with numbered extensions like .001, .002, .003, etc., you're dealing with a split archive. These files have been divided into smaller parts using a "file splitter" to make large files easier to store, transfer, or back up.
Each numbered file represents just a fragment of the complete program. To restore the full application or data, these parts must be "joined" together and then extracted using a "file joiner" tool.
Once joined, the result could be an ISO or BIN file, a directory of installation files, or in some cases, a ready-to-run .exe executable file.
The primary reason for splitting large files is to save storage space. Another key reason is that FAT32 file systems cannot store files larger than 4GB. Therefore, files exceeding 4GB need to be split if stored on FAT32.
Pro Tip: The .001 file contains all the necessary information to combine and extract the rest of the numbered parts (e.g., .002, .003, .004, etc.).
What Is a .001 File?
A file with a .001 extension is usually the first part of a split archive created using tools such as 7-Zip, WinRAR, or HJSplit. These are not standalone files—they require other parts to function.
How Split Archives Work
- The original file is split into smaller parts with extensions like .001, .002, .003, etc.
- All parts are needed to extract the full file successfully.
- You start the process by opening or extracting the .001 file.
- The software will automatically recognize and combine the rest of the parts.
Note: These files are not the same as ZIP or RAR formats. Special tools are required to open and join them.
How to Open 001 Files with 7-Zip
7-Zip is a free and reliable tool to open .001 files and extract their contents. Here's how:
- Download and install 7-Zip.
- Navigate to the folder containing your .001 file.
- Right-click on the .001 file and select 7-Zip > Extract Here.
- 7-Zip will automatically detect and join the other parts (.002, .003, etc.) and extract the complete file.
TIP: Ensure all file parts are in the same directory before extracting. If the file was originally an ISO, you may receive a .BIN and .CUE file, which can be burned using CD/DVD creation software.
How to Join 001 Files with HJSplit File Joiner
HJSplit is another great tool for rejoining split files. To use it:
- Download HJSplit, unzip it, and run the program.
- Click "Join" from the main interface.
- Click "Input File" and select the .001 file.
- Select an Output File name and location.
- Click "Start" to begin the joining process.
- Once complete, go to the output directory to access your combined file.
As long as all parts (.001, .002, etc.) are in the same folder, HJSplit will automatically detect and combine them.
Frequently Asked Questions
What is a .001 file?
A .001 file is part of a multi-part archive created using file splitting or compression tools like 7-Zip, HJSplit, or WinRAR. It’s the first chunk of a larger file divided into smaller pieces for easier transfer or storage.
Can I open .001 files without the other parts?
No. You must have all related parts (e.g., .002, .003, etc.) present in the same folder. These files work together as pieces of one larger archive, and cannot be extracted individually.
How do I open 001 files with 7-Zip?
Install 7-Zip, right-click the .001 file, and select 7-Zip > Extract Here. Make sure all related parts (.002, .003, etc.) are in the same folder. 7-Zip will automatically combine and extract the complete file.
Can HJSplit be used to join .001 files?
Yes. HJSplit can rejoin split files. Just open the tool, select "Join", and choose the .001 file. HJSplit will detect the rest of the parts and reconstruct the original file.
Are .001 files safe?
If obtained from a trusted source, they are generally safe. However, always scan downloaded files with antivirus software to ensure they don’t contain malware or malicious code.
What happens if the .001 file is missing?
If the first part (.001) is missing, you won’t be able to join or extract the archive. The .001 file contains the index and structure needed for the other parts to be interpreted correctly.
What if 7-Zip doesn't recognize the .001 file?
Ensure all split parts are in the same folder and follow a consistent naming pattern. If the archive was not created using 7-Zip or is corrupted, you may need to try another tool like HJSplit or re-download the files.
Final Thoughts: Extract 001 Files the Easy Way
To open or extract 001 files is simple if you have the right tools. Whether you're using 7-Zip for both joining and extracting, or HJSplit as a dedicated file joiner, the process is quick and user friendly.
Just remember:
- Always keep all file parts in the same folder.
- Start with the .001 file.
- Use reliable software like 7-Zip or HJSplit.
With the steps outlined above, you'll have no trouble rejoining and extracting split archives. Now you can open 001 files with confidence!