右键单击文件名->打开方式"->选择要使用此类文件打开的编辑器.并将其设置为默认编辑器，以供将来打开时使用该特定文件扩展名(即.txt)打开文件.

RightClick on the file name -> Open With -> Choose the editor you wish to open with this kind of file. And that sets to be default editor for opening files with that particular file extension ( i.e., .txt ) when opened in future.

编辑:以上过程不是永久性的过程.试试这个-

The above procedure is not a permanent one. Try this -

• 右键单击文件名.
• 选择获取信息

• 从打开方式下拉菜单中选择一个.这将被设置为默认应用程序，并在以后打开.txt文件时使用.

• Choose one from the Open With drop down. This will be set as default application and is used in future if opened the .txt file.