So I followed the instructions and importing my Win7 theme to the latest Win10 failed epically, it was completely corrupt.

On top of that, opening my Win10 theme which I have been modifying with Msstyles and saving it has deleted 200 of the images and can't be opened in msstyles because it is corrupt, so that leaves little confidence for any theme created by WSB to be deployed.

And this I am told is still used by the professionals here to create custom themes? Incredibly hard to believe...