The getItemInfoByAtom function in the ActiveX control for Microsoft Windows Media Player 9.0 returns a 0 if the file does not exist and the size of the file if the file exists, which allows remote attackers to determine the existence of files on the local system.
https://exchange.xforce.ibmcloud.com/vulnerabilities/18587
https://euvd.enisa.europa.eu/vulnerability/EUVD-2004-1322