How to decompress .lz4?

Below is how I did it:

I downloaded the latest version by the system architecture (64 or 32bit) from https://github.com/lz4/lz4/releases/tag/v1.9.2

Extracted the zip file.

1. Move to the extracted file in terminal (cmder, windows cmd or xshell).

2. Run the command

   lz4.exe C:\Users\rta\somefile.tar.lz4 C:\Users\rta\somefile.tar 
   

   (this command will automatically decompress the file with lz4 extension).
   Output is:

   C:\Users\rta : decoded 19962408960 bytes

Hope it answers the question.

UPDATE: 7-Zip ZS can be used to extract lz4 files and its just like 7zip. After installation, just right click the file and choose extract option.

The program can be downloaded from here https://github.com/mcmilk/7-Zip-zstd/releases