Hello tjahelka,

Welcome to the Forum!

Excel disables embedded images as a security precaution. Base64 encoding makes it very difficult for anti-virus software to detect a possible threat. Since the pictures are static, you other option would to be copy the images and paste them on to the worksheet and save the changes before exporting the file. Not being familiar with actionscript, I'm not how to do this or it can be done at all.