Do you remember you saw this review or what the file is supposed to contain ?
Compressed files ( .rar , .zip ) from unknown sources can sometimes contain malware, even if the site lists "good reviews" (which can be faked). mockupy.rar
"Mockupy" is often a name used for websites or creators providing for branding, packaging, or UI design. The File: A .rar file is a compressed folder. Do you remember you saw this review or
It could be a niche utility tool or a script (e.g., for Figma, After Effects, or Blender) used to automate the creation of mockups. mockupy.rar
Users often leave reviews on platforms like Gumroad, Creative Market, or GitHub.