High. "Parted" archives are a common way to bypass basic antivirus scans, as the malicious payload is split across multiple files and only becomes "active" once fully reassembled and extracted.
Only proceed if the file originated from a trusted, official digital storefront (e.g., Steam, GOG, Epic Games Store).
Games distributed in this format often require "cracks" or bypassed executables, which are frequently flagged as Trojans or Ransomware.
By itself, this file is unusable. It contains only a slice of the overall data. Extraction will fail unless the full set is present.
Downloading and opening multi-part archives from unofficial sources carries significant risks:
Filenames using this specific "partXX" convention are standard on file-sharing platforms, torrents, and Usenet. Security & Risk Assessment