Digital Editions on PC not opening epub file that works perfect on Mac Any trouble-shooting advice? I'm very frustrated with the removal of flash from media controls in Adobe Acrobat and Reader. We have a very long book laid out in InDesign that has been shared as an interactive PDF for 7+ years. As the media controls (play, pause, stop etc) are flash components, the functionality is being removed as a PDF in Dec 2020, and much of the controls have already been stripped. From Adobe reps, I've been told to export our large book from InDesign as an epub file. I've done this. From the InDesign preview panel, all the media functions are shown as expected. On my mac, within Digital Editions, the exported epub file's media also functions as expected. However, on PCs the Digital Editions program refuses to even open the file. The error provided by Digital Editions is also not helpful. It simply reads:Unable to open "file name".epubErrors were encountered in this item. The Digital Editions Version on the PC is Version 4.5.11.187303&n