Convert 7Z.004 to 001

Understanding 7z.004 and 001 file formats

7z.004 is a part of a split archive created by the 7-Zip compression tool. When a large file or folder is compressed and split into multiple parts, each segment is given a sequential extension such as .7z.001, .7z.002, .7z.003, and so on. These files are not standalone archives; they are fragments of a single compressed archive and must be combined to extract the original data.

001 files, in this context, refer to the first part of a split archive. The .001 extension is commonly used for the initial segment in multi-part archives created by various archiving tools, including 7-Zip and HJSplit. Like .7z.004, a .001 file is not a complete archive by itself.

Can you convert 7z.004 to 001?

Directly converting a 7z.004 file to a 001 file is not a standard or meaningful operation. Both are parts of a split archive, and their extensions indicate their sequence in the archive. Changing the extension from .7z.004 to .001 will not make the file usable as the first part of the archive, nor will it allow extraction of the contents. The correct approach is to have all parts of the split archive (from .7z.001 onwards) in the same folder and use an extraction tool to combine and extract the files.

How to extract split 7z archives

To access the contents of a split 7z archive, you need all the parts (e.g., .7z.001, .7z.002, .7z.003, .7z.004, etc.) in the same directory. Then, use a compatible extraction tool to open the .7z.001 file, which will automatically process the subsequent parts.

Best software for handling split 7z archives

• 7-Zip (Windows, free): The native tool for creating and extracting 7z split archives. To extract, right-click the .7z.001 file and select 7-Zip → Extract Here or 7-Zip → Extract to "folder".
• PeaZip (Windows, Linux, free): Another excellent tool for managing split archives. Open the .7z.001 file and use Extract from the menu.
• Keka (macOS, free): Supports 7z split archives. Drag the .7z.001 file onto the Keka window to extract.

Summary

There is no practical conversion from 7z.004 to 001 as both are parts of a split archive. To access the data, gather all parts and use a tool like 7-Zip to extract the archive starting from the .7z.001 file.