Depending on the origin of the file, you may encounter the following:
In signal processing and statistics, this refers to algorithms used for adaptive filtering and audio compression. RLS - 2_comp.7z
It can also refer to application/rls-services+xml used in resource lists. 2. Extracting the Archive Depending on the origin of the file, you
The official, open-source tool designed for this format. Keka (macOS) : A popular alternative for Mac users. RLS - 2_comp.7z
