I personally have never used this work around as I feel it isn't required as I said.
With the different levels of protection of and the fall back of the Standard Shield, I find the need for daily scheduled scans lessened. I prefer to do a manual scan with my regular weekly maintenance tasks.
So I would have to look at the references in the How To link I gave.
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Multiple paths must be separated by a space and any paths that include a space in the path name must be in quotes. Here are a couple of examples:
"C:\Program Files\Alwil Software\Avast4\ashQuick.exe" C: E: - this will scan the entire contents of the C: and E: drives
"C:\Program Files\Alwil Software\Avast4\ashQuick.exe" "C:Program Files" E:Downloads - this will scan the contents of the Program Files folder on the C: drive and the Downloads folder on the E: drive, including all subfolders (Note the first path is in quotes due to the space in the folder name "Program Files")
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If you have tried this syntax and it doesn't work then perhaps the paths are incorrect, I see some possible flaws in that the path to the drives or folders seem to be missing the \ try it with that and see if it works, e.g. :
"C:\Program Files\Alwil Software\Avast4\ashQuick.exe" C:\ E:\ - this will scan the entire contents of the C: and E: drives
"C:\Program Files\Alwil Software\Avast4\ashQuick.exe" "C:\Program Files" E:\Downloads
However, since no one has mentioned this in the thread I don't know if this is a factor. But all this is for no purpose if it isn't absolutely necessary to use this to schedule scans, you have to have a reason for wanting to do this ?
Most people say they want to do it because their previous AV did it, but the avast on-access scanners reduce this need and a manual scan at Standard sensitivity doesn't take that long.