for /f "delims=" %%i in ('dir /a/b *.exe ^| findstr /n /i .*') do (
  SET topic[!n!]=%%i
  CALL echo %%topic[!n!]%%
)
:end

SET /p %a%=Select Num:

:SymLoop
if defined topic[%x%] ( 
   set /a "x+=1"
   GOTO :SymLoop
)

SET /p %a%=Select Num:

SET fileName= !topic[a]!
@echo on

xelatex.exe -synctex=1 -interaction=nonstopmode %fileName%
xelatex.exe -synctex=1 -interaction=nonstopmode %fileName%
xelatex.exe -synctex=1 -interaction=nonstopmode %fileName%
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