Microsoft confirmed today that its Windows 7 USB/DVD Download Tool had indeed contained open-source code -- but it wasn't intentional. As first suspected by the blog Within Windows, Redmond had contracted the project to a third party, and simply didn't catch the code during its review process.

Microsoft has gone a step further, conducting a review of other code provided through the Microsoft Store -- though, the company didn't find any other offenders. The software giant said it will reintroduce the tool to the Microsoft Store next week, and will also disclose its source code as well as the binaries in compliance with the General Public License (GPL v2).

The company pulled its Windows 7 USB/DVD Download Tool earlier this week after being accused of using code from a utility called ImageMaster in a way that violated the GPL v2.