.mov format is similar to avi in that the actual file encoding inside it could be anything.
We normally recommend staying away from .mov files as most are spam, and usually porn spam (ie: named to what you are looking for.) And it's my guess the file size of the file you downloaded is less than 50 MB.

Advice: 1. Movie download issues (click on blue link) (2nd last post has information on best video formats.) and also 2. How to find music which applies to searching for videos also.