The launch of the PC version of Batman: Arkham Knight’s Batgirl: A Matter of Family DLC has been delayed so developer Rocksteady can fix the core game, Warner Bros. has announced.

Once the core game is up to standard, the DLC will be available.

“We apologise for the delay and only want to make sure that any content that we offer is up to the standards that PC players expect,” said Warner Bros.

“We have heard the PC gaming community outcry of disappointment for the initial launch of Batman: Arkham Knight on PC. Again, we would like to apologise to you, the fans, and let you know that we are taking full responsibility for releasing a product that did not meet our quality standards, which is why we suspended sales of the game as soon as we understood the issues.

“The Batman: Arkham Knight fans are extremely important to us and our highest priority is ensuring PC users get the full, high quality experience of Batman: Arkham Knight they deserve.

“Addressing the PC performance issues is still our top priority and at this time, we believe we have identified a number of fixes for the larger issues that were affecting PC players at launch.”

It promised an update later this week.

The disastrous launch of Arkham Knight on PC has also seen Warner Bros. modify the internal review process for all of its games.

The game launched despite serious problems with the PC version, which was developed at Iron Galaxy Studios. The PC version was then pulled from sale, with Warner stating that fixes could take some time.

Meanwhile, two anonymous QA staff who supposedly worked on the game said Warner knew it was in a "a horrible state".