User Guide

User’s Guide 131
Using the WinGuard Scanner
• Choose file types for scanning. Virusescannotinfectfilesthat
contain no executable code, whether script, macro, or binary code.
You can, therefore, safely narrow thescope of yourscan sessions so
that the module examines only those files most susceptible to virus
infection.To do so, select the Program files only button.
To see or designate the file name extensions that the E-Mail Scan
module will examine, click Extensions to open the Program File
Extensions dialog box (Figure 4-10).
Figure 4-20. Program File Extensions dialog box
See “Adding file name extensions for scanning” on page 313 and
“Current list of vulnerable file name extensions” on page 314 to
learn which file name extensions this module scans by default and
how to add to or change this list.
• Scan all files. Select the All files button to have the E-Mail Scan
module examine any file, whatever its extension, whenever you or
a system process modifies it in any way.
5. Turn onheuristic scanning. Click Advanced toopen the AdvancedScan
Settings dialog box (Figure 4-11).
Figure 4-21. Advanced Scan Settings dialog box
Heuristic scanning technology enables the E-Mail Scan module to
recognize new virusesbased on their resemblance to similarviruses that
themodulealreadyknows.