The .IBOOKS file extension is basically an eBook application program developed by Apple Corporation. This file format works for the OS X and iOS operating systems and devices.
After converting the file to the new format, you will be able to use other programs to support it. Keep in mind, however, that the BOOKTEMPLATE file after converting to IBOOKS may differ slightly from the original. The most important information should be kept, but if you want the file after conversion from BOOKTEMPLATE to IBOOKS to be the same, you have to do this carefully and choose the proper application from the list below.
There is no guarantee, of course, that the conversion will come up to all your expectations, but it will certainly help you. If, after all, the effect of converting BOOKTEMPLATE to IBOOKS does not meet your expectations, you can simply try to find on the Internet a different version of your file in BOOKTEMPLATE format, properly converted to a IBOOKS file by someone else. If this fails, use the information provided in the further part of the website.
Unfortunately, if after performing the two previously described steps (trying to find your BOOKTEMPLATE file converted by someone else, and the attempt to convert it to IBOOKS on your own) you still have a problem with your file, then there are only a few solutions left. You can once again try to find and install an application that can open the BOOKTEMPLATE file in its original format (without conversion to IBOOKS file). Such a solution will be difficult to implement, but it certainly will give the best result.