there's no builtin EPDM fileplugin for Altium Designers prjpcb files and EPDM can't read references and properties.
You have to write EPDM fileplugin for a such things to be available. Though you can access some properties through standard INI fileplugin by adding prjpcb extension to INIplugin on the client's computer registry. Just create registry brunch
and add REG_MULTI_SZ key 8 with value IniPlugin.dll (use FileFormats\.ini brunch as a an example).
Then you can add variable mapping for prjpcb files.
prjpcb stores properties data like that:
so block name will be Parameter5 and attribute name Value.
As parameters order can vary if create AD project from scratch, you have to use templates for every new project.
References should be added by hand in this case.