Parameter, meaning a "command-line argument"? I would expect that if you are able to pass the additional argument (which would have to be the first one!), you should be able to put the quotes around the filename as well... (or not?)
Otherwise, ashQuick can hardly tell whether you pass a single filename to it (containing spaces) or multiple areas... OK, some simple checking possibly could be added (such as if the whole commandline forms a name of an existing file, use it - don't split)