Context: You need to troubleshoot some pre-report or post-report trigger from a SQL*Report file, for example from E-Business suite.
To generate the source file (rex file) from an RDF File:
$ORACLE_HOME/bin/rwconverter stype=RDFFILE source=<NAME>.rdf dtype=REXFILE dest=<NAME>.rex userid=apps/<password>@<service> batch=yes