File Dis51usr.ini Of Oracle Discoverer 10g

[andresdip2002]

Hi everybody ..
It is not a problem but they are two questions,
1) What is the parameter in the registry of the system that allows to Oracle Discoverer 10g him to go to look for the file dis51usr.ini?
2) The file dis51usr.ini is equal to the file pref.txt? because in no side of metalink is spoken of the file dis51usr.ini
Any have idea?