VHDNamePattern REG_SZ ODFC_%username% Specifies a string pattern used when creating a profile VHD(X) file Variable names are delimited with '%' characters Supported variables are %username%  %userdomain%  %sid% %osmajor%  %osminor%  %osbuild%  %osservicepack%  %profileversion%  %clientname%  and any environment variable