editing OPF on sigil and adding flash file
I've been trying to add audio flash file to my ebook using sigil.
I've managed to find the right code and add it to the HTML.
now, I need to add the filename.swf in the manifest in the OPF file. how do I reach it through sigil? if I look at he folder itself, I have only epub and zip files. so I need to extract them then zip again. seems to me like there is a bettter way to do that. also, how do I add to flash file in sigil?