The Open button provides the option to Open From Disk and Open From Server
Open From Disk: open an RDL file stores locally on your machine.
Open From Server: Download an RDL file from a report server.
The Save button provides the option to Save to Disk and Deploy to Remote Server.
Save To Disk: save your template as an RDL file.
Deploy To Remote Server: Publish your report on the Reporting Services server.
The Import Template button allows you to import an existing XLSDOC, XLSXDOCX, or XLSM DOCM file
The View button sends a request to Reporting Services to run your report, then