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Retro7zip is a native backport of 7-Zip for DOS and oldMicrosoft Windows operating systems.

Retro7zip run on nearly all DOS and Windows computers that have a 32-bit CPU.

https://github.com/dajhorn/retro7zip/wiki/System-Requirements

On FreeDOS, download the versioned release file and do this:

RENAME 7zip-24.09+3_dos.zip 7zip.zipFDNPKG INSTALL 7zip.zip

On any other platform, unzip the release file and put theEXE filesanywhere in the%PATH%.

The release package for DOS contains three executable files:

1. 7zm.exe Miniature for DOS

Runs on computers that have less than 8 megabytes of memory. Implements onlythe BCJ2 filter, LZMA2 codec, and 7Z container that are used in regular 7-Ziparchives.

2. 7zr.exe Reduced for DOS

Runs best on computers that have at least 8 megabytes of memory. Implementsall filters, codecs, and containers for the archive formats that 7-Zip canread and write. (7z, bz2, gz, tar, xz, zip.)

3. 7za.exe Aggregated for DOS

Contains all upstream features, including support for filesystem images andexotic archive formats. Requires more than 8 megabytes of memory to unpacksome complex files. (Run7za i for a complete list of supported types.)

The release package for Windows contains one executable file:

4. 7za.exe Aggregated for Win32c

Use this program if you need:

• Better performance.
• File sizes larger than the 2GB DOS limit.
• Long file names on Windows NT, because the NTVDM lacks the LFN API thatDOS applications use.

The DOS variants are compatible withntlfn-0.81.71,but the Win32c variant is better for Windows NT.

The LZMA SDK is copyright Igor Pavlov and released into the public domain.

7-Zip is an aggregate work, copyright Igor Pavlov, that is subject tomultiple licenses that are described in theCOPYRIGHT.txtfile and theLicense.txt file.

Retro7zip is a derived work, copyright Darik Horn, that is released intothe public domain.