Mine

H:\>type test.txt
one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen
one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen
one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen

H:\>type colmove.cmd
@echo off
::move column5 to column1
for /f "tokens=1-15 delims=," %%a in (%1) do echo %%e,%%a,%%b,%%c,%%d,%%f,%%g,%%h,%%i,%%j,%%k,%%l,%%m,%%n,%%o >> test-output.txt

H:\>colmove test.txt

H:\>type test-output.txt
five,one,two,three,four,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen
five,one,two,three,four,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen
five,one,two,three,four,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen

H:\>\