The program scans all the files on your computer for malicious software by default. However, you can specify the types of files to scan by following these steps:
Click on Status in the main window of the program.
In the Protection section, click Settings.
Make sure that the Known threats option is selected.
Click on the Settings option corresponding to the protection you want: Scan files on disk, or scan instant messaging.
Go to the Scan tab.
If you want to scan only files with certain extensions, select Files with the following extensions and click Extensions....
A list of the extensions that will be scanned appears. You can remove or add extensions to the list. To remove an extension, select it and click on Remove. To add a new extension, write it in the textbox and click Add. The Clear list button removes all extensions from the list, and the Restore list button restores the original extensions. In this window you can also indicate if you want to scan files without an extension or all Office files (regardless of the extensions in the list).
Click OK.
To indicate the type of networks to be scanned, click Advanced settings.
The Log in the report option (enabled by default) lets you specify whether this type of incident should be logged in the report.