While looking up STEP file Colors, as per Andy's post, this analyzer, ( dated 2021 ), showed up:

https://www.nist.gov/services-resources/software/step-file-analyzer-and-viewer

(Old pdf link:) There is a PDF in the zip dated 2021-2023
https://www.govinfo.gov/content/pkg/GOVPUB-C13-81540483507fe73691ffd13c46408b96/pdf/GOVPUB-C13-81540483507fe73691ffd13c46408b96.pdf

I have no idea if it is any good, or useful.

- Brian

It looks like there may be other beneficial Links(?)