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Set custom right click command on folder ​

bat
: ./mycustomthing.reg
Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\Directory\Background\shell\customthing]
@="Execute My custom Thing from here"
"Icon"="<path_to_.exe>"

[HKEY_CLASSES_ROOT\Directory\Background\shell\customthing\command]
@="cmd /K \"<my_custom_command_here>\""

Visible in folder context ​

bat
Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\Directory\Background\shell\customthing]
@="Execute My custom Thing from here"
"Icon"="<path_to_.exe>"

[HKEY_CLASSES_ROOT\Directory\Background\shell\customthing\command]
@="cmd /K \"rez env something -- something\" %V"