To extract files in Workspace Web Application:
Stop the service for Hyperion Foundation Services - Managed Server.
Backup file <EPM_ORACLE_HOME>/products/Foundation/workspace/InstallableApps/workspace.ear.
Using an unarchiving utility, extract the contents of <EPM_ORACLE_HOME>/products/Foundation/workspace/InstallableApps/workspace.ear into a <temp directory>.
Extract the contents of <temp directory>/workspace.war into <temp directory>/war.
Update the file you are patching under <temp directory>/war.