An offline launcher for Minecraft written in Batch.

mco.bat

@echo off
IF "%1" == "-jar" goto file_not_exists ::If the argument -jar is added, you can set a new minecraft.jar.
IF EXIST "%APPDATA%\jar" goto file_exists
IF NOT EXIST "%APPDATA%\jar" goto file_not_exists


:file_exists ::If a previous config is found, it will just ask for the username.
set /p JAR=<"%APPDATA%\jar"
set /p uname="Username: "
java -Xincgc -Xmx1024m -cp "%APPDATA%\.minecraft\bin\%JAR%;%APPDATA%\.minecraft\bin\lwjgl.jar;%APPDATA%\.minecraft\bin\lwjgl_util.jar;%APPDATA%\.minecraft\bin\jinput.jar" -Djava.library.path="%APPDATA%\.minecraft\bin\natives" net.minecraft.client.Minecraft "%uname%"

goto eof

:file_not_exists ::If no previous config was found, create a new one.
set /p setJAR="Minecraft jar (.minecraft\bin\): "
echo %setJAR%
echo "%setJAR%" > "%APPDATA%\jar"
set /p uname="Username: " 
java -Xincgc -Xmx1024m -cp "%APPDATA%\.minecraft\bin\%setJAR%;%APPDATA%\.minecraft\bin\lwjgl.jar;%APPDATA%\.minecraft\bin\lwjgl_util.jar;%APPDATA%\.minecraft\bin\jinput.jar" -Djava.library.path="%APPDATA%\.minecraft\bin\natives" net.minecraft.client.Minecraft "%uname%"

goto eof

:eof