When scanning archives, the System Scanner uses a recursive scan: Archives in archives are also unpacked and scanned for viruses and unwanted programs. The files are scanned, decompressed and scanned again. (Options available in expert mode only.)
All archive types
If this option is enabled, the System Scanner detects whether a file is a packed file format (archive), even if the file extension differs from the usual extensions, and scans the archive. However every file must be opened for this, which reduces the scanning speed. Example: If a *.zip archive has the file extension *.xyz, the System Scanner also unpacks this archive and scans it. This option is enabled as the default setting.
Only those archive types marked in the archive list are supported.
Unpacking and scanning recursive archives can require a great deal of computer time and resources. If this option is enabled, you limit the depth of the scan in multi-packed archives to a certain number of packing levels (maximum recursion depth). This saves time and computer resources.
In order to find a virus or an unwanted program in an archive, the System Scanner must scan up to the recursion level in which the virus or the unwanted program is located.
Maximum recursion depth
In order to enter the maximum recursion depth, the option Limit recursion depth must be enabled.
You can either enter the requested recursion depth directly or by means of the right arrow key on the entry field. The permitted values are 1 to 99. The standard value is 20 which is recommended.