mailbox.conf
This file contains 2 lines of code that indicate where the data to be appended (bundled) prior to header trailer wrapping is to be located, and where it will be located after it is wrapped.
The value for both of these lines is:
install_dir\tmgr_vn.n.n\mmgr\bundle
where n.n.n represents the current version of Trading Manager
Changes can be made to the code to point to a different directory structure, but other changes will need to be made in order to accommodate such a change. Also, it is restricted to a file-based destination.