win10/11 打开未知文件 / 打开方式提示 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”页面中创建关联 解决方法
win10 打开未知格式文件，选择打开方式，对于未知格式，虽然有各种软件可以选，但是没有图下选项，不能将该未知格式与应用绑定为默认打开方式。
解决很简单，打开注册表，导入如下脚本即可。查看是否导入成功的路径为 计算机 \HKEY_CLASSES_ROOT\Unknown\shell\openas，脚本：
1.reg
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}"2.reg
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}"保存为 .reg 文件后，图标会变成注册表的样子。双击打开它们，导入到注册表即可。注册表里可以看到，已经成功导入了。打开方式 - 选择其他应用，就可以愉快设置默认打开应用了。
https://blog.csdn.net/no_say_you_know/article/details/126803343
