1. A method for using a file manager application that executes on a client computing device to initiate information management operations for virtual machines in conjunction with a storage manager that manages an information management system, the method comprising: receiving, by a storage manager that manages information management operations in an information management system, a first query from a file manager application executing on a client computing device, to determine whether a user-selected virtual machine is represented in secondary storage in the information management system; if the storage manager determines that the virtual machine is represented by one or more secondary copies thereof in the secondary storage, based in part on retrieving information from one or more media agents associated with previously creating the respective one or more secondary copies, responding to the file manager application with indications of the respective secondary copies to be displayed to the user as respective file-representations that are usable for further user-initiated information management operations in the information management system; receiving, by the storage manager, one or more messages from the file manager application indicating that a first information management operation has been initiated by the user of the file manager application for a first file-representation of the virtual machine, wherein the first information management operation comprises at least one of: a backup of the first file-representation of the virtual machine to a secondary storage device in the information management system, an archiving of the first file-representation of the virtual machine to the secondary storage device in the information management system, and a restoring of the first file-representation of the virtual machine from the secondary storage device in the information management system; in response to the one or more messages received from the file manager application, managing, by the storage manager, the first information management operation which comprises: (i) instructing a media agent with access to the secondary storage device to coordinate data transmission for the first file-representation of the virtual machine to and from the secondary storage device as directed by the storage manager, and (ii) receiving, by the storage manager from the media agent, metadata about the first information management operation; reporting, by the storage manager, one or more results of the first information management operation to the file manager application for presentation to the user by the file manager application; and updating, by the storage manager, an associated management database, the updating comprising storing the metadata received by the storage manager from the media agent to the management database.