Try this
AutoHotkey script!
Almost untested, so please test it before you distribute it or use it on any vital files.
Skrommel
FileSelectFolder,folder,,2,Please select a folder
If folder=
ExitApp
Loop,%folder%\*.msf,0,1
{
SplitPath,A_LoopFileLongPath,name,dir,ext,name_no_ext,drive
IfExist,%dir%\%name_no_ext%.sbd
{
FileGetAttrib,attrib,%dir%\%name_no_ext%.sbd
IfInString,attrib,D
FileMove,%dir%\%name_no_ext%.msf,%dir%\%name_no_ext%.msf.old
}
}