SQL Server Attach DB : failed to retrieve text for this error. Reason: 15105

Got this error in SSMS when trying to attach an old DB.

failed to retrieve text for this error. Reason: 15105

Quick answer - run Management Studio as Administrator. The error SSMS was giving on attach then displayed correctly, and in this case was a combination of two things:

• Inadequate permission on the MDF and LDF files
• Trying to attach a 2008 R2 DB on a plain 2008 server

Meh.