: How to Open pdf, ncx, opf files? I have an ebook downloaded from my university elearning site, it was downloaded, not online reading. But it can only be opened and readed from university's

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I have an ebook downloaded from my university elearning site, it was downloaded, not online reading. But it can only be opened and readed from university's elearning app (android only, no iOS app for it) and the ebook can not be printed. I was stuck because i'm not used to read whole text book on android phone i want to print it or if i read the ebook, it should be on laptop or big screen desktop not small phone.

After looking up into file explorer inside my android phone, i figure out that the ebook that was downloaded coming from either (or even both):

abcFolderName/123.epub

and/or

META-INF/container.xml
1.pdf
2.pdf
3.pdf
4.pdf
...
...
...and so on...
...
...
419.pdf
canbold.otf
canitalik.otf
canregular.otf
content.opf
mimetype
stylesheet.css
toc.ncx
*Note: all of those files above are contained in single .abcFolderName/ folder.

and somehow the provided university's elearning app compile all of those files so it can be read from the app.

This is what i've tried so far:

Converting 123.epub to PDF -> ERROR when converting
Opening 123.epub with various EPUB reader (lithium on android, calibre on computer, chrome epub reader on computer) -> SO FAR no luck, all return an error.
Opening single 1.pdf, 2.pdf, 3.pdf and so on, one by one, with various PDF reader (on android and on computer) -> SO FAR no luck, all return an error.
Importing whole folder from Calibre software to make it (compile it) into single ebook -> SO FAR no luck at all.

I'm frustrated by this since the book is hundreds of pages and i cannot read it other than on my small android phone.

Please help me,
Thanks.

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