Thanks Ashzification I found a solution:
Make a .batch file with:
mkdir %APPDATA%\.techniclauncher\temp
"C:\program files\java\jre7\bin\java.exe" -Djava.net.preferIPv4Stack=true -Xmx1G -jar %APPDATA%\.techniclauncher\technic-launcher.jar
Just one thing:
The first time I start the launcher I can login and everything works,
the second time the launcher can't connect to minecaft.net and the tumblr feed is down.
You can fix it by deleting your lastlogin file in .techniclauncher
Now my question is if there is a beter way, so you don't have to delete the lastlogin file
everytime?