Vlk, which level of sensibility is necessary for on-access extension recognition?
'Normal' won't test the extensions?
In help files there are few information:
Standard Shield checks the programs you start and the files you access. It will not allow an infected program to be started - so, the virus code cannot be activated.
Normal. Default setting.
High. In addition to the default setting, created and modified files will be scanned as well.
For on-demand is more clear:
Quick Scan. Only the possibly dangerous files are scanned, according to their extension. It means that the files with extensions EXE, SCR, COM, DOC, etc. are scanned. Within the file, avast! looks only for those viruses that infect the corresponding type of file. It means that macroviruses are not searched for in EXE files etc.
Standard Scan. Only the possibly dangerous files are scanned, according to their content. The file extension is ignored. Again, only the viruses corresponding to the particular file type are searched for.
Thorough Scan. All files are tested, against all viruses.