User Account Control
A feature released with Windows 10's Fall Creator update, Controlled Folder Access is a feature released by Microsoft to protect a user's important files from the growing threat of Ransomware. This feature was released about a year later after the Petya family of ransomware first appeared. The feature will notify the user every time a program tries to access these folders and will be blocked unless given access via the user. Windows will warn the user with a User Account Control popup as a final warning if they opt to "Allow" a program to read Controlled Folders.