Microsoft Internet Explorer 9 through 11 allows remote attackers to determine the existence of files via crafted JavaScript code, aka "Internet Explorer Information Disclosure Vulnerability."
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-0162
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-037