Does Symantec Scan Engine 5.2.x officially support WinZip 12 and zipx files?
Typically when Scan Engine 5.2.10 or lower runs into a Winzip12 or zipx file, it may throw Decomposer error 41. Decomposer error 41 means "unknown algorithm found".
Symantec Scan Engine starts to support Winzip 12 and zipx files in build 5.2.11. Note that WinZip 12 and zipx files were not officially supported prior to build 5.2.11.