In Windows Vista or Windows 7 the manual file association editor has been removed. So you can have problems with running executable jar by double-clicking it. You can solve it in different ways:
1) Most easiest way is to use program Jarfix
2) Also you can add file association in your command prompt window using "Run as administrator”:
C:\>assoc .jar=jarfile
C:\>ftype jarfile="C:\path\to\your\javaw.exe" -jar "%1" %*
