Very few people who work in games media are surprised that GTA 5 has been data mined, VG24/7 reports.

"Files are ripped out of pre-launch downloads all the time; we just don't bother to report on it. It's particularly egregious on home PC formats, because more people are motivated to browse around in their Windows innards than have bothered to learn how to fossick around inside the PlayStation 3, but the Xbox 360 is no stranger to leaked files either," the website writes.

"Publishers and platform holders do their best to keep these assets secure, of course, but it's a never-ending war of attrition on the side of the millions of people out there with an interest in bypassing safeguards - be it for the intellectual challenge or more nefarious purposes - and the trade off for the convenience of pre-loading is we will occasionally see leaks of this magnitude."

The site also contends a Grand Theft Auto 5 pre-load file leak suggests its October 1 release date version will be a 18GB download.

Rockstar has released a new trailer online, showing off a range of activities, from team skydiving to shootouts, but Grand Theft Auto 5 will also allow users to build Minecraft-like racetracks around the city.

The game's racetrack-building feature is rumored to draw in millions of fans of the block placing game.

While Grand Theft Auto 5 is expected to launch September 17 for the Playstation 3 and the Xbox 360.