Opening Spotfire sample files fails with error "The file ... cannot be opened. The file may be damaged or in an unknown format."

Opening Spotfire sample files fails with error "The file ... cannot be opened. The file may be damaged or in an unknown format."

Opening a sample file from the "Samples" section of the TIBCO Spotfire Analyst home screen throws an error:

This could possibly be caused if the Spotfire user license that provides permission for opening Spotfire files has not been enabled for the user's Spotfire group.  To open Spotfire analysis .dxp files such as these sample files, Spotfire users and Spotfire user groups need to have at least the "TIBCO Spotfire Enterprise Player > Open file" license enabled for them by a Spotfire Administrator. 

1. Log on to the TIBCO Spotfire Analyst Client with an administrator account
2. Go to Tools > Administration Manager > Groups and Licenses > Select the user's groups > Licenses tab
3. Ensure at least "TIBCO Spotfire Enterprise Player > Open file" is enabled