jar程序不能打开的解决办法

打开jar程序出现了以下错误：

MissingFieldException[ 启动文件中缺少下列必需字段：<jnlp>]
 at com.sun.javaws.jnl.XMLFormat.parse(Unknown Source)
 at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
 at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
 at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
 at com.sun.javaws.Main.launchApp(Unknown Source)
 at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
 at com.sun.javaws.Main$1.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)

可以下载一个jarfix软件修复就可以打开了。