aswVmm.dll.sum doesn’t appear in the Avast! folder at all, but aswVmm.dll in the folder is 20.5Kb and dated 09/05/2013.
The files that were on my root directory are dated 07/07/2013.
aswVmm.dll is 21Kb
aswVmm.dll.sum is 1Kb
The root directory files having a more recent date made me wonder if Avast! was updating properly, but Avast! itself is telling me it last updated within the last hour, so it seems to be updating as it should. Current version is 130709-1.