c:\A.txt|c:\AA.txt
c:\B.txt|c:\BB.txt
c:\C.txt|c:\CC.txt
c:\D.txt|c:\DD.txt
c:\E.txt|c:\EE.txt
c:\F.txt|c:\FF.txt
c:\G.txt|c:\GG.txt
c:\H.txt|c:\HH.txt
c:\I.txt|c:\II.txt
c:\J.txt|c:\JJ.txt
c:\K.txt|c:\KK.txt
c:\L.txt|c:\LL.txt
c:\M.txt|c:\MM.txt