http://wccftech.com/windows-10-controlled-folder-access-fight-ransomware/

Microsoft started releasing Windows 10 Fall Creators Update to the public last week. While the latest feature update offers a number of notable features and improvements, it also brings a major security feature that may have got buried under all the fancy stuff. With the Fall Creators Update, the Redmond software maker has made it a little easier for you to protect valuable data from ransomware.

Microsoft had first talked about this feature back in June, introducing it with Windows 10 Insider Preview build 16232. The new Controlled folder access feature within Windows Defender prevents malicious apps from changing the contents of selected protected folders. This feature essentially lets users control what apps can access certain, protected folders.