Form object
Sets the file name and path (in FORMS’ database) of the file containing the image of the front page of a form produced outside FORMS and imported via Interpret. (Use SetArchiveImage if the image was created (exported) by FORMS.) Note that if you use this method to rename image files, you must rename them in a separate step.
FormScanEnd would be an appropriate event from which to call this method.
Use SetSourceImage2 for the back page.
Import image files (FORMS Help topic)