Here you define the basic behavior of the scan routine for an on-demand scan. If you select certain directories to be scanned with an on-demand scan, depending on the configuration the Scanner scans:


The Scanner can use a filter to scan only those files with a certain extension (type).

All files

If this option is enabled, all files are scanned for viruses or unwanted programs, irrespective of their content and file extension. The filter is not used.

If All files is enabled, the button File extensions cannot be selected.

Smart Extensions

If this option is enabled, the selection of the files scanned for viruses or unwanted programs is automatically chosen by Avira AntiVir Server. This means that Avira AntiVir Server decides whether the files are scanned or not based on their content. This procedure is somewhat slower than Use file extension list, but more secure, since not only on the basis of the file extension is scanned. This setting is activated by default and is recommended.

If Smart Extensions is enabled, the button File extensions cannot be selected.

Use file extension list

If this option is enabled, only files with a specified extension are scanned. All file types that may contain viruses and unwanted programs are preset. The list can be edited manually via the button File extension.

If this option is enabled and you have deleted all entries from the list with file extensions, this is indicated with the text "No file extensions" under the button File extensions.

File extensions

With the aid of this button, a dialog window is opened in which all file extensions are displayed that are scanned in Use file extension list mode. Default entries are set for the extensions, but entries can be added or deleted.

Please note that the default list may vary from version to version.

Additional settings

Scan boot sectors of selected drives

If this option is enabled, the Scanner only scans the boot sectors of the drives selected for the on-demand scan. This option is enabled as the default setting.

Scan master boot sectors

If this option is enabled, the Scanner scans the master boot sectors of the hard disk(s) used in the system.

Ignore offline files

If this option is enabled, the direct scan ignores so-called offline files completely during a scan. This means that these files are not scanned for viruses and unwanted programs. Offline files are files that were physically moved by a so-called Hierarchical Storage Management System (HSMS) from the hard disk onto a tape, for example. This option is enabled as the default setting.

Integrity check on system files

When this option is enabled, the most important Windows system files are subjected to a particularly secure check for changes by malware during every on-demand scan. If an amended file is detected, this is reported as suspect. This function uses a lot of computer capacity. That is why the option is disabled as the default setting.

Optimized scan

When the option is enabled, the processor capacity is optimally utilized during a Scanner scan. For performance reasons, an optimized scan is only logged on standard level.

This option is only available on multi-processor systems, but is always displayed in the configuration and can be enabled: If the administered server does not have more than one processor, the Scanner option is not used.

Follow symbolic links

If this option is enabled, Scanner performs a scan that follows all symbolic links in the scan profile or selected directory and scans the linked files for viruses and malware. This option is not supported by Windows 2000 and has been deactivated.

The option does not include any shortcuts, but refers exclusively to symbolic links (generated by mklink.exe) or Junction Points (generated by junction.exe) which are transparent in the file system.

Scan process

Scanner priority

With the on-demand scan, the Scanner distinguishes between priority levels. This is only effective if several processes are running simultaneously on the workstation. The selection affects the scanning speed.


The Scanner is only allocated processor time by the operating system if no other process requires computation time, i.e. as long as only the Scanner is running, the speed is maximum. All in all, work with other programs is optimal: The computer responds more quickly if other programs require computation time while the Scanner continues running in the background. This setting is activated by default and is recommended.


The Scanner is performed with normal priority. All processes are allocated the same amount of processor time by the operating system. Under certain circumstances, work with other applications may be affected.


The Scanner has the highest priority. Simultaneous work with other applications is almost impossible. The Scanner completes its scan at maximum speed, however.