Here's my stab at it:
Sub test()
Dim testString As String
Dim test As Long
Dim output As String
testString = "C:\Users\z204685\tecware\RESULTS\D1369_3 (R=0) Surface Failure"
test = InStrRev(testString, "\")
output = Right(testString, Len(testString) - test)
End Sub
Hope it gets you close!