Malicious actors often use generic, "official-sounding" German names like "Datei herunterladen" (Download file) to trick users into downloading malware.
and run a virus scan if you have already downloaded it.
Knowing the website or context could help me track down if it's related to a specific online ARG (Alternate Reality Game) or a known digital archive.
In many online communities (especially gaming or digital art), creators release "Previews" of their work in compressed .rar files.