Whether you are using a resident anti-virus program such as AVAST or AVG Free Edition to help protect yourself or a scan-on-demand program such as Clam Antivirus for Windows, here is a list of the top 50 most vulnerable file extensions. If your current scans are taking to long, consider limiting the searches to these extensions.
.386 .asp .bat .bin .bmp .boo .chm .cla .class .cmd .cnm .com .cpl .dev .dll .do* .drv .eml .exe .gif .hlp .ht* .ini .jpeg .jpg .js* .lnk .md*
.msg .nws .ocx .ov* .pcx .pgm .php* .pif .png .pot .pp* .scr .shs .smm .sys .tif .vbe .vbs .vbx .wmf .xl* .zl*