Cannot restore Amazon RDS SQL Server database to given point-in-time using SQL Server Management Studio
I would try scripting out the operation instead of running whatever Management Studio is doing "for" you. You shouldn't need to use xp_fileexist (assuming you can validate that the files actually exist in the place the script says). Using 2012 SSMS, I am restoring to a point in time that does not coincide directly with a log backup:



The resulting script in my case was:

BACKUP LOG ... WITH NOFORMAT, NOINIT, NOSKIP, NOREWIND, NOUNLOAD, NORECOVERY
RESTORE DATABASE ... WITH FILE = 1, NORECOVERY, NOUNLOAD
RESTORE LOG ... WITH FILE = 1, NORECOVERY, NOUNLOAD
...
RESTORE LOG ... FROM DISK = [...path from line 1...] WITH NOUNLOAD, STOPAT = &lt;time&gt;