Maybe this can be of interest to compression developers:
http://www.pismotechnic.com/pfm/Mount ZIP, ISO, and Private Folder files as virtual folders to the Windows file system using the Pismo File Mount Audit Package. Free download.
Pismo File Mount
Pismo File Mount is a Windows system extension that enables application controlled virtual and user mode file systems. Using Pismo File Mount, applications can expose all kinds of program and user data through the Windows file system interface.
I can possibly be expanded to allow for other formats....