Here is a section taken from the Getting started guide from the 5.2.11 build.(Page 10)
Symantec Scan Engine can now process specific container types
of size up to 30 GB.
A new parameter called DecFileSize allows Symantec Scan
Engine to decompose top-level container files of type tar/rar/zip
up to 30 GB. For other container types, the maximum top-level
container file size can be up to 2 GB.
https://www-secure.symantec.com/connect/forums/scan-engine-5211-max-file-size
tar/rar/zip----> 30GB limit
Others ----> 2GB limit