Image controls support only one format: StdPicture (which is a data structure in memory).
LoadPicture convert the picture into that data structure. LoadPicture support bmp gif ico wmf, most jpg and a few older file formats.
If you want to load png or tif you have to use GdiPlus... A lot of code, e.g.
http://www.vbarchiv.net/tipps/tipp\_1264-ersatz-fuer-die-vb6-loadpicture-funktion.html
Andreas.