Convert arj to zipx

What is the difference between .arj and .zipx?

Description: The ARJ Compressed File Archive (.arj) is a file format used for data compression and archiving. Developed in the early 1990s by Robert Jung, ARJ stands for "Archived by Robert Jung". The format allows for efficient compression of files, supporting multi-volume archives, which means a large archive can be split into several smaller files for easier management and distribution. It also supports a high level of encryption for secure data storage.; WinZip, starting with version 12.1, uses the extension .zipx for ZIP files that use compression methods newer than DEFLATE; specifically, methods BZip, LZMA, PPMd, Jpeg and Wavpack. The last 2 are applied to appropriate file types when "Best method" compression is selected.