REM Check Windows Version
ver | findstr /i "5\.0\." > nul
IF %ERRORLEVEL% EQU 0 goto ver_2000
ver | findstr /i "5\.1\." > nul
IF %ERRORLEVEL% EQU 0 goto ver_XP
ver | findstr /i "5\.2\." > nul
IF %ERRORLEVEL% EQU 0 goto ver_2003
ver | findstr /i "6\.0\." > nul
IF %ERRORLEVEL% EQU 0 goto ver_Vista
ver | findstr /i "6\.1\." > nul
IF %ERRORLEVEL% EQU 0 goto ver_Win7
goto warn_and_exit

:ver_Win7
:Run Windows 7 specific commands here
REM echo OS Version: Windows 7 (debug line)
goto end

:ver_Vista
:Run Windows Vista specific commands here
REM echo OS Version: Windows Vista (debug line)
goto end

:ver_2003
:Run Windows Server 2003 specific commands here
REM echo OS Version: Windows Server 2003 (debug line)
goto end

:ver_XP
:Run Windows XP specific commands here
REM echo OS Version: Windows XP (debug line)
goto end

:ver_2000
:Run Windows 2000 specific commands here
REM echo OS Version: Windows 2000 (debug line)
goto end

:warn_and_exit
echo Machine OS cannot be determined.

:end

Set RegQry=HKLM\Hardware\Description\System\CentralProcessor\0
 
REG.exe Query %RegQry% > checkOS.txt
 
Find /i "x86" < CheckOS.txt > StringCheck.txt
 
If %ERRORLEVEL% == 0 (
    Echo "This is 32 Bit Operating system"
) ELSE (
    Echo "This is 64 Bit Operating System"
)

C:
   IF NOT EXIST C:\WIN\NUL GOTO NOWINDIR
   CD \WIN
   :NOWINDIR

XCOPY /S /Y  copies directories and overwrites without prompt

rmdir [Drive:]Path [/s] [/q]

Parameters
[ Drive : ] Path   : Specifies the location and name of the directory that you want to delete. 

/s   : Removes the specified directory and all subdirectories including any files. Use /s to remove a tree. 

/q   : Runs rmdir in quiet mode. Deletes directories without confirmation. 

editing a file:
Below is about the best you can do with Windows batch. I auto named the output as requested, doing one better - It automatically preserves the extension of the original name.

@echo off
SetLocal
cd /d %~dp0
Set "OldString=[HFloat(undefined),HFloat(undefined),HFloat(undefined)],"
Set "NewString="
set file="test.mpl"
for %%F in (%file%) do set outFile="%%~nFCleaned%%~xF"
pause
(
  for /f "skip=2 delims=" %%a in ('find /n /v "" %file%') do (
    set "ln=%%a"
    setlocal enableDelayedExpansion
    set "ln=!ln:*]=!"
    if defined ln set "ln=!ln:%OldString%=%NewString%!"
    echo(!ln!
    endlocal
  )
)>%outFile%
Known limitations

•limited to slightly under 8k per line, both before and after substitution
•search string cannot include = or !, nor can it start with * or ~
•replacement string cannot include !
•search part of search and replace is case insensitive
•last line will always end with newline <CR><LF> even if original did not

Calling a function:
:functionName
Arguments are referred to as %1, %2 etc, or %~1 to strip off quotes
ends in 
goto:eof

is called as 
call :functionName arg1 arg2   (can have quotes, can use commas)

We don't want to do this anyway in an installer


set /p choice=Do you want to continue? [y/n]
if /i '%choice%'=='Y' goto label1
goto label2