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Well that is an avast file and I have it in my avast4 folder, so I suggest you check it out at one of the multi engine scanners, which is what you really should have done first, confirm detections.

You should also check the suspect file at: VirusTotal - Multi engine on-line virus scanner I feel virustotal is the better option as it uses the windows version of avast (more packers supported) and there are currently over 30 different scanners.
Or Jotti - Multi engine on-line virus scanner if any other scanners here detect them it is less likely to be a false positive. Whichever scanner you use, you can’t do this with the file in the chest, you will need to move it out.

The MD5 of C:\Program Files\Alwil Software\Avast4\AhResWS.dll is af4e5eb372f516ef061e65e8973b57b5

File properties, see image.