In the past when I work in Painter I've always saved it as a .rif file unless I intended to open it in Photoshop. I did this because .rif is supposed to be the native file format for Painter and preserves all the editing capabilities, etc.
I now want my painter files managed by LR so which format comes closest to preserving all the layers and features of painter but is indexable and viewable in LR?
Wayne