To add a command to the right-click context menu when clicking inside a folder on Windows 10, you can create a .reg file and make changes to the registry. Here are the steps to create the .reg file and add the command:

1. Open the Registry Editor by clicking Start, typing "regedit" in the search box, and clicking on the regedit.exe program.
2. Navigate to the appropriate key for the context menu you want to modify. For example, to add a context menu item to the right-click menu on a folder in the left panel of Windows Explorer or on the background of a directory in the right panel for a normal user, navigate to HKEY_CURRENT_USER\Software\Classes\directory\Background\shell.
3. Right-click on the "shell" key and select "New" > "Key". Name the key as you want to name the context menu item.
4. Right-click on the new key and select "New" > "Key". Name this key "command".
5. Double-click on the "(Default)" value in the "command" key and enter the path to your program followed by "%1" (or "%V" if the path has spaces). For example, if your program is located in C:\Program Files\MyProgram\myprogram.exe, the value would be "C:\Program Files\MyProgram\myprogram.exe" "%1".
6. Optional: to add an icon, add a string value named "icon" for the key created in step 3 with a value matching an icon resource path. For example, "%SystemRoot%\System32\shell32.dll,3".
7. Optional: to display only on shift-click, add an empty string value named "Extended" for the key created in step 3.
8. Optional: to customize the menu entry label, change the value of the default value for the key created in step 3.
9. Optional: to change the menu entry location, add a string value named "Position" with one of: Top, Bottom.
10. Save the changes to a .reg file by clicking on File > Export, selecting a location to save the file, and giving it a name with the .reg extension. 

If you want to add a command to delete empty folders to the context menu, you can create a .reg file with the following contents:


```
Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\Directory\shell\Delete empty folders]

[HKEY_CLASSES_ROOT\Directory\shell\Delete empty folders\Command]
@="cmd /c for /f \"usebackq delims=\" %%d in (`\"dir \"%1\" /ad/b/s | sort /R\"`) do rd \"%%d\""
```

This will create a "Delete empty folders" command in the context menu when you right-click on a directory. 

Note that modifying the registry can be risky, and it can cause irreversible damage to your installation if you don't do it correctly. It's recommended to make a full backup of your device before proceeding, or alternatively, create a system restore point, which will also help you to revert the changes you make using this guide.
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