@shodanx2 ,
Alternately, install the Customize Toolbar plugin, enable Plugins > Customize Toolbar > Custom Buttons, then edit ...\plugins\Config\CustomizeToolbar.btn to include something like the following:
File,Open Containing Folder,cmd,,onion.bmp,onion.ico,onion.ico
File,Open Containing Folder,Explorer,,*R:Ex,*G:Ex,*B:Ex
The first line uses a pair of BMP (16x16, 256 color) and ICO files I had readily available to do the open-containing-folder-in-cmd, and the second line does the explorer version: it uses a RED-background Ex if using Standard Icons, a GREEN-background Ex if using Fluent icons in Light Mode, and a BLUE-background Ex if using Fluent icons in Dark Mode:
d8b62c68-ba9c-4138-a0e8-6025055143fa-image.png
a9742ca9-9ef4-4440-acd5-8ef82c33aa10-image.png
d14c69f5-60ab-489f-8237-5546e6a8aeb3-image.png
As mentioned here, the extra spaces around the buttons are due to an unfixed bug in the CustomizeToolbar plugin. The workaround is to also define a replacement icon for the Show Symbol default toolbar entry using
View,Show Symbol,Show All Characters,,Icons\allChars.bmp,Icons\allChars_off.ico,Icons\allChars_off_dark.ico
That issue-comment has links to where you can get the BMP and two ICO files for that button.
But using that in addition to the commands I showed earlier will make the button toolbar more compact:
edd28df4-f9e6-42b1-9bfd-979527514a54-image.png