今天准备修改电脑 host 文件，一直报错“该文件没有与之关联的应用来执行该操作。请安装应用，若已经安装应用，请在"默认应用设置"页面中创建关联”，哪怕右键选择打开方式也报这个错误，索性把过程贴上来避免以后遇到还得到处找。

用途

修改 Windows 对“未知文件类型”（没有默认程序打开的文件）时提示该文件没有与之关联的应用来执行该操作。请安装应用，若已经安装应用，请在“默认应用设置.

使用教程

  1. 桌面新建 txt ，复制代码进去，重命名，保存为 .reg 文件：
  2. 双击导入注册表
  3. 系统会提示“是否确实要添加注册表信息”，点击“是”
    成功后生效，无需重启
Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\Unknown\shell\openas]
@=hex(2):40,00,25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,\
  00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,\
  68,00,65,00,6c,00,6c,00,33,00,32,00,2e,00,64,00,6c,00,6c,00,2c,00,2d,00,35,\
  00,33,00,37,00,36,00,00,00
"MultiSelectModel"="Single"

[HKEY_CLASSES_ROOT\Unknown\shell\openas\command]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
  00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,4f,00,70,00,\
  65,00,6e,00,57,00,69,00,74,00,68,00,2e,00,65,00,78,00,65,00,20,00,22,00,25,\
  00,31,00,22,00,00,00
"DelegateExecute"="{e44e9428-bdbc-4987-a099-40dc8fd255e7}"

[HKEY_CLASSES_ROOT\Unknown\shell\OpenWithSetDefaultOn]
"MultiSelectModel"="Single"
"ProgrammaticAccessOnly"=""

[HKEY_CLASSES_ROOT\Unknown\shell\OpenWithSetDefaultOn\command]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
  00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,4f,00,70,00,\
  65,00,6e,00,57,00,69,00,74,00,68,00,2e,00,65,00,78,00,65,00,20,00,2d,00,6f,\
  00,76,00,65,00,72,00,72,00,69,00,64,00,65,00,20,00,22,00,25,00,31,00,22,00,\
  00,00
"DelegateExecute"="{e44e9428-bdbc-4987-a099-40dc8fd255e7}"