Resolution:
Yes, BE 2.0 is tested/Supported on AIX 5.3 (64bit enabled platform).

To use BusinessEvents in 64-bit mode, you must have TIBCO Runtime Agent configured for 64-bit mode.

After verifying that TIBCO Runtime Agent and other required TIBCO software is configured for 64-bit mode, please take a backup of the following files -

* Backup be-engine
copy TIBCO_HOME/be/version/bin/be-engine to TIBCO_HOME/be/version/bin/be-engine.bak

* Backup be-engine.tra
copy TIBCO_HOME/be/version/bin/be-engine.tra to TIBCO_HOME/be/version/bin/be-engine.tra.bak

Perform the following steps:
1. Copy the 64 bit wrapper from the TIBCO Runtime Agent installation directory:
copy TIBCO_HOME/tra/&ltversion>/bin/wrap64 to TIBCO_HOME/be/2.0/bin/be-engine

2. Make these changes in be-engine.tra:
In the tibco.env.STD_EXT_CP property, find RV_HOME/lib and replace it with RV_HOME/lib/tibrvj.jar.