It’s not the official app of the International Dutch Oven Society, but rather a full DOS emulator for iPhones and iPads that cost just $1. Within hours of its October 2010 debut, users had figured out how to load Windows 3.1 and scads of classic computer games on their iPhones and iPads, using the file transfer utility in iTunes.
Violation: Apps that run unsigned code, such as the entire Windows operating system, are a big no-no in the App Store. A second version of iDOS used a hidden hack to sideload old DOS programs, but was also booted by Apple.
Jailbreak Alternative: DOSPad is the same exact app, available through Cydia.