This is a 7-Zip compressed archive, which uses high-ratio compression (LZMA) to make large files much smaller.
It may be a community-created mod or a collection of assets for a game, where "Robin" is a character and "Frnd" (Friend) indicates a specific companion or social mod. Robin_Frnd_Bending.7z
Since the file ends in , here is what you need to know to handle it safely: This is a 7-Zip compressed archive, which uses
7z is the new archive format, providing high compression ratio. 7zip Malware: Beware 7zip.com 7zip Malware: Beware 7zip
It could be a fan-made collection of images or videos, compressed into the .7z format to save space. Technical Details of the File Format
It seems that "" refers to a specific compressed archive file, but based on current records, it is not a widely known software package, official document, or viral media file with a public description.