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

在任意文件上鼠标右键,选择打开方式或者选择其他应用时报错“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”,错误现象如下:
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打开注册表,发现HKEY_CLASSES_ROOT\Unknown\项缺失,将注册表恢复即可解决该问题

恢复方法:分别复制以下代码到记事本,然后另存为.reg后缀的两个文件,依次双击运行恢复注册表项即可。

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}"
Windows Registry Editor Version 5.00

[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}"

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转载自blog.csdn.net/ywd1992/article/details/130467291