Which permissions does the File Owner have in Chatter which a File Collaborator does not have?

Answer: ‘Make files private’ permission and ‘delete files’ permission.

Explanation:
A File Collaborator has these permissions on a file
View, download, share, change permission, edit the file, upload
new versions of the file while a File Owner has these
permissions on a file. View, download, share, change
permission, edit the file, upload new versions of the file, make
files private, delete files.