Title: The Definitive Edition: An Analysis of Ultra Street Fighter IV and the 2014 PC Exclusive Landscape
The PC-Exclusive Catch:
While not a "PC exclusive" (it was also on PS3, Xbox 360, and later PS4), the PC version was a major focus due to its transition in infrastructure.
Capcom could not allow a fan mod to outperform their corporate infrastructure. The C&D landed hard. The download links vanished. The developers went silent. However, like a ghost in the machine, the files survived.