The Trend Micro NAS Security™ scan engine can extract and scan files compressed using any of the most popular compression types (listed below). Trend Micro NAS Security™ can also check for viruses being "smuggled" within nested compressions, for example, an infected file that is zipped, ARJ-compressed, MS-compressed, and zipped again.
The maximum number of recursive scan layers is 20.
ZIP
ZIP to EXE
Cabinet (.cab)
ARJ
ARJ to EXE
TAR
GZIP (.gz)
BZIP and BZIP2
ASPAC
UPX
LHA
LHA to EXE
MSCOMP
LZEXE
PKLite
Diet
UNIX LZW compress(.Z)
UNIX pack(.z)