without a sandbox environment. .rar files can contain executable scripts or "Zip Bombs" designed to crash a system upon extraction.
: Since "Plaumenmus" is a specific food item, the archive may contain digitized family recipes, photos of a harvest, or documentation of a traditional cooking process from a specific event in 2009. Plaumenmus_09.rar
Given the name, the archive likely falls into one of three categories: without a sandbox environment