While the original Resident Evil did end up being released for PC/Windows back in the day (1996 in Japan, 1997 in North America/Europe), the original hasn't seen any kind of new re-release for PC since then. The original Resident Evil 2 and 3 are also in a similar instance with all of the classic trilogy not having modern releases for PC (or availability in general outside of PS Store).
Although, in the case of 2 & 3, they did end up getting a re-release for PC on 2006, however, this re-release was exclusive to Japan, and was made by SourceNext, the company which also worked on the initial PC port of Resident Evil 4.
Capcom still hasn't given any statement regarding this possibly leaked rating, but fans have jumped into the rumours claiming that this could be hinting at a modern/remastered release of the original Resident Evil for modern consoles and PC, with some also hoping to see the original Resident Evil 2 and Resident Evil 3: Nemesis getting a similar treatment and have the classic trilogy available through a wide variety of consoles and PC.
