Dark Souls developer From Software is having a torrid time getting its beloved action RPG up and running on PC and has confirmed it isn't including any optimisations for desktop gamers.

Producer Daisuke Uchiyama told Eurogamer that it had underestimated how tough it would be to port the game across.

"To be completely honest, we're having a tough time doing it due to our lack of experience and knowledge in terms of porting to PC. First we thought it would be a breeze, but it's turned out not to be the case. We're still developing right now - we're crunching right now.

"In Japan there's not much of a PC market and we haven't really taken into consideration that audience before. That's one of the reasons why we haven't been able to step up on the PC platform until now."

Uchiyama went on to confirm that it hasn't fixed the frame rate problems that had hobbled certain parts of the game on consoles.

"In terms of the frame rate for say, Blighttown, From Software sincerely apologises for that happening [in the console version]," he said.

"In terms of the PC version, the quick answer is no, [we won't be fixing the frame rate problems]. Because we wanted to get the PC version out as soon as possible, it's more strictly a port from the console version. We haven't been able to step up into doing any specific optimisation for PC.

"However, in exchange for that, we have prioritised adding new content for both original players and new players."

Happily, that new content appears to be very substantial. Uchiyama estimated that it should take a reasonably skilled player around 10 hours to get through the new areas.

What's more, it'll be fully integrated into the game rather than siphoned off from the main menu. Console gamers who buy it as DLC will be able to use their existing character, though they'll need to have progressed quite a way through the story before they can access the extra areas.

"We have three new venues, four new bosses and additional weapons," he explained.

"Accessing the new content is a little bit complicated. Depending on where you are in the storyline it may differ in terms of how it's integrated.

"There will be a certain point in the game that you'll have to surpass to access the new content. It won't be right from the beginning - the new content will be accessible more in the later half of the game."

The added narrative focuses on the character Artorias, referenced throughout the original release but never seen.

"In the console version only the name of Artorias has been brought up, but in the new content you'll actually see him as a character," revealed Uchiyama.

"The story itself is going to take place in the past. The player will be dragged into the past, 300 years back when Artorias was not a legend but actually existed."

Finally, Uchiyama touched on the future of the franchise, insisting that there are currently no plans for ports to other platforms or a full sequel.

"We are fully concentrating on delivering the PC version and DLC. There has not been any discussion about anything past that. So there's nothing in the works right now," he said.

"Speaking from the developer's perspective, even considering the new Wii U features or the Vita, because they are so specific to those platforms, if we were able to do something on those systems the game would be designed to fit those platforms rather than just be a port from the PS3 or 360."

Dark Souls: Prepare to Die Edition launches for PC on 31st August, with the new content the landing on PlayStation 3 and Xbox 360 as DLC towards the end of the year.