>My image files are included into my project. I would like to add a different image into a report. I guess I need to add an OLE/picture control into my report. But that control need ControlSource with existing file on disk. Instead of that, is it possible to use a variable containing the name (withtout path) of my image (the one included in my project)? Otherwise, how can I do that?

You must first save that image on disk and then use it as ControlSource in that OLE bound control:

lcFileName = ADDBS(SYS(2023))+FORCEEXT(SYS(2015),[PICTURE EXTENTION HERE])
STRTOFILE(FILETOSTR([ThePictrureInEXE.EXT]), lcFileName)

*** use m.lcFileName as ControlSource in REPORT
REPORT FORM ....
ERASE (m.lcFileName)