Microsoft WordPad in Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 allows a remote code execution vulnerability due to the way it parses specially crafted files, aka "WordPad Remote Code Execution Vulnerability".
https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8588