vs extensibility - Adding a custom editor for a custom binary type (zip) -

it looks can't tell vs want custom editor .myext type. if file text file, works fine. however, wanted file .zip structured content, i.e. manifest.json file , other files inside it.

i did original tests manifest.json , everythign worked, i'm able create custom editor (although had problems opening json editor default). however, switching .zip file renamed .myext breaks everything. tried override editor chooser implementing ivseditorfactorychooser still doesn't work.

how can tell vs support new extension even if it's not text file ?

thanks leads.