The suffix signifies that this is a "scene-adjacent" or community release rather than an official digital storefront download (like from Steam or GOG).
The 1.0.3.7 update was a post-launch patch focused on optimization and bug fixes. Key elements of this version typically include: IXION.v1.0.3.7-P2P.torrent
: Resolution of specific quest-line soft locks and UI glitches. Nature of the File The suffix signifies that this is a "scene-adjacent"