Hello,
Jouni told me it needs to be like this:
/ext="chm hlp vbs"
That is, when using the /ext parameter with multiple extensions, you need to use quotes and delimit the extensions using the space character.
Also note that if you are using wildcards *.* for the scanned location path, then the /ext parameter is not counted and all file types are scanned instead.
Best Regards: Tamas Feher, Hungary.