Arquivo: Undertale.v1.08.zip ... -

[Release] Undertale v1.08 (Windows) - Original Archive

Full game files for Undertale version 1.08. This archive is provided for archival and educational purposes. Ensure all dependencies are met before running the executable. Arquivo: Undertale.v1.08.zip ...

That looks like a file name for a specific version of —likely shared on a forum, archive site, or a private community. [Release] Undertale v1