ibisPaint is the software that uses .ipv drawing files, but unfortunately, it does not support export to Photoshop's .psb (large) files, only standard PSD file. If you really need to PSB version of the PSD file, then you have to either solve that with Photoshop or find another tool that can work with ibisPaint drawings, there are not many though.
Updated: September 15, 2023