If you try to restore an SSAS 2008 .abf backup file to an SSAS 2005 instance, you will get the error

TITLE: Microsoft SQL Server Management Studio

------------------------------

The following system error occurred:  The file exists. . (Microsoft SQL Server 2005 Analysis Services)

------------------------------

BUTTONS:

OK

------------------------------

clip_image002

The solution:

1. Restore to SSAS 2008 instead. You’ve probably got the wrong version