Following up on my video here C# SolidWorks API Tutorial - 06 SolidDNA Command Manager Groups Tabs & Exporting Files - YouTube  I've now made a tool to help generate the IconList type images that are needed for the SolidWorks Command Manager tabs and menu items.

The tool is open sourced and available here solidworks-api/Tools/CommandManager Icon Generator at master · angelsix/solidworks-api · GitHub

The compiled version so you can just run it is here https://www.fasetto.com/folder/preview/318700825bc7409fb8fa67f2f38f2a99 (in New SolidWorks 2017 Files)

The updated tutorial that uses these icon lists is here solidworks-api/Tutorials/06-Exporting at e9bcdaa2c416d19e2df9ecd2cd97a06629538ae2 · angelsix/solidworks-api · GitHub

The tool generates all the image sizes supported by SolidWorks, 20, 32, 40, 64, 96 and 128px sprites. Simply drop your images onto the exe to create the lists, or double click the exe and type each file path to each image you want to add to the list.

Hopefully this is useful to some.