I keep several of my custom icons in homemade .dll files as shown here:
When Listary displays these in the popup menu:
The icons are not shown.
You can see in the screenshot that the “Google Photos” and “Icons” folder have custom icons assigned, but Listary does not show them. By contrast: The folders “@KMS19” and “@NKHS19” are reading icon files from inside of the respective folders. It’s also worth noting that the tree icon for folder “@WorkingDocs” is also in a .dll, but it’s the default Windows C:\Windows\System32\shell32.dll file.
Windows 10 64x
Reading the favorites on Total Commander 8.0 32x