.com.apple.timemachine.donotpresent is a system file created by TimeMachine on OSX by user choice.
@@ -15,6 +15,7 @@ Icon
.TemporaryItems
.Trashes
.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
# Directories potentially created on remote AFP share
.AppleDB
Manuel Leonhardt