T-SQL Update Random String Value in Column I have a table that contains a file path column containing data like this.  

C:\ABC\Files\AA.dat
C:\ABC\Files\AA.Unbound.qp
C:\DEF\AA\GGG Build 1 Modules\Random123.qpp
C:\DEF\AA\GGG Build 1 Modules\Random456.qpp
C:\GH\DC.Random789.qpp
C:\IJK\Random987.qpp


I need to replace the file path to a generic path before the actual file name, so everything before the final \ needs to change but keep the same file names, something like this 

D:\FILES\AA.dat
D:\FILES\AA.Unbound.qpp
D:\FILES\Random123.qpp
D:\FILES\Random456.qpp
D:\FILES\DC.Random789.qpp
D:\FILES\Random987.qpp


Table has around 2000 rows and if possible I want to update in a single script. Running SQL 2008R2 and this is first stage of finally upgrading so any help would be appreciated.
One possible approach is to reverse the full filenames and find the actual file names.

Table:

CREATE TABLE Data ([FileName] varchar(100))
INSERT INTO Data([FileName])
VALUES
    ('C:\ABC\Files\AA.dat'),
    ('C:\ABC\Files\AA.Unbound.qp'),
    ('C:\DEF\AA\GGG Build 1 Modules\Random123.qpp'),
    ('C:\DEF\AA\GGG Build 1 Modules\Random456.qpp'),
    ('C:\GH\DC.Random789.qpp'),
    ('C:\IJK\Random987.qpp'),
    ('Random000.qpp')


Statement:

UPDATE Data
SET [FileName] = CONCAT(
   'D:\FILES\',
   REVERSE(LEFT(REVERSE('\' + [FileName]), CHARINDEX('\', REVERSE('\' + [FileName])) - 1))
)


Result:

FileName
D:\FILES\AA.dat
D:\FILES\AA.Unbound.qp
D:\FILES\Random123.qpp
D:\FILES\Random456.qpp
D:\FILES\DC.Random789.qpp
D:\FILES\Random987.qpp
D:\FILES\Random000.qpp