There is information about module that holds File in the File object reference.
|Reported by:||pczapla||Owned by:||nobody|
|Has patch:||no||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
I had troubles to find the module name of the File object using the google search.
The file object reference seams to be the most natural place for such information but it doesn't have it.