Untrusted search path vulnerability in Microsoft Windows Progman Group Converter (grpconv.exe) allows local users, and possibly remote attackers, to execute arbitrary code and conduct DLL hijacking attacks via a Trojan horse imm.dll that is located in the same folder as a .grp file.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12209
http://www.vupen.com/english/advisories/2010/2200