Analysis Services - Backup and restore errors: File '.abf' specified in Restore command is damaged or is not an AS backup file. The following system error occurred: Access is denied. (Microsoft SQL Server 2008 R2 Analysis Services)

If you experience this error when an SQL Server Analysis Services backup is restored, most probably the reason is Analysis Services – Service account has no permission on the file (or folder). Simply grant permission for the account by accessing its properties – Security tab.