There are zillions of file types unknown to us, but as strict content type validation is on by default, we will (and do) reject many things customers use.
- Refine strict content type validation so that it only rejects known mismatches (you said 'X', but it looks like 'Y'), and allows unknowns in (you said it's 'X'/nothing, but I'm not sure what it is)
- Make it easy for customers to add content type overrides (e.g. for situations where they've made their own content types)
- Presumably those overrides should be in sonatype-work