There are several legitimate reasons (and a few risky ones) for this search:
Some developers have released Python scripts that can unpack specific archive formats (e.g., arc_unpacker.py). These are safer than random EXEs because you can read the source code.
Check Reddit (r/de_pc_gaming), ComputerBase, or Chip.de forums. Users often share verified hashes (MD5/SHA256) of safe unwrappers.
Example filename: MeinTraumhaus_Setup_deutschland_spielt.exe