Simple answer, yes, it's a false positive.
Less simple, heuristic detection (by any program) is more likely to report a legitimate file as being a possible threat, because of the expected or projected behaviour of that file. (Don't ask me how Avast makes this determination.)
This especially seems to be true of security software, I think because good security software has the ability to access parts of the file system not usually accessible.
Superantispyware has a feature called "DDA", for Direct Disk Access.
I suspect the driver for this is what's being flagged.
So, if this file belonged to something else, the suspicious behaviour would definitely be a cause for further investigation.
NOt really a "False Positive", more a genuine and valid detection, that in this case proves harmless.