How to open files with 7z 001 extension

The easy fix that follows deals with opening or extracting split files with numbered extensions (.001,.002,.003,.004, etc.).

The files contained in a 7Z.001 file can be extracted using 7-Zip (Windows), The Unarchiver (Mac), or B1 Free Archiver (multiplatform).

Verify that every file (FileName.7z.001, FileName.7z.002, FileName.7z.003, and so forth) in your multi-volume archive is kept in the same directory.

Use your archive utility to extract the files from your 7Z.001 file.

The folder containing your 7Z.001 file will then contain the files from your multi-volume archive.

Entire information needed to open and ‘join’ the remaining .002, .003, .003, .004 files together and enable its extraction is contained in the file that ends in .001.

A compressed file set or split archive usually contains files with the .001 file extension.

The original file is broken up into smaller portions, each denoted by a different file extension, such as .001, .002, .003, and so forth.

You need each component in order to extract the original file. These numbered sections are typically recognized by archive software, which enables you to extract the content back into a single file.

For the most part, you only need to open or extract the first file, .001, and the software will find and use the other files if they are in the same directory on its own.

Macs have built-in tools for decompressing ISO, Zip, and other file formats, but they don’t include a preinstalled app for opening 7z files. Nevertheless, you can still use external software like Unarchiver to unzip 7z Mac files.

On a Mac, decompressing 7z files is a simple process. To quickly unzip a 7z file on a Mac, follow these steps:

  1. Get Unarchiver here. This program is free. It is available for download through the Mac App Store or the official website.
  2. Disable Unarchiver. Upon program launch, a file association list will appear. Choose 7z files.
  3. Double-clicking any 7z file on your Mac will cause the unpacking program to open it like any other archived format once it is connected to 7z. Launching Unarchiver and dragging and dropping 7z files into the window is another option.
  4. Before attempting to open or interact with the file’s contents, give it some time to complete its decompression.

Particularly when working with very large files, compressed files are generally easier to share and take up less space. However, you must extract them to make them return to their original size in order to view and interact with the contents.