I've found that in Google Drive Google Doc "files" show up as 0 bytes. It also can't be downloaded.
a) Is this normal/correct?
b) If so, Is there any way to tell if the "file" is a Google Doc file other than checking the size?
Sorry, at this time there is not yet support to download files in the Google Docs format.
These files need to be handled in a special way and it's on our todolist to investigate this and add support for this.