sigil will not open book.original_epub

[mrmikel]

But it means that it has to be unzipped before you can find that. It could take a while to unzip the files in a directory before displaying them.

Seems they decided on the simple and direct approach.

[DaleDe]

Originally Posted by mrmikel

But it means that it has to be unzipped before you can find that. It could take a while to unzip the files in a directory before displaying them.

Seems they decided on the simple and direct approach.

Not true. The mime file is intentionally not compressed so that the zip file does not need to be unzipped. Why else would they insist that it be uncompressed. It does have to be opened but not unzipped. It is certainly still a bit faster to look at the extension but Unix does not use extensions preferring the less vulnerable approach. od -c will produce:

0000000 P K 003 004 \n \0 \0 \0 \0 \0 C y 242 B o a
0000020 253 , 024 \0 \0 \0 024 \0 \0 \0 \b \0 \0 \0 m i
0000040 m e t y p e a p p l i c a t i o
0000060 n / e p u b + z i p P K 003 004 024 \0
0000100 002 \0 \b \0 D y 242 B 9 357 > 005 274 \0 \0 \0

where PK 003 004 shows it is a zip archive and the mime type will always start at the offset 2E

Dale

[mrmikel]

You are correct Dale. Poor terminology on my part.

[cybmole]

Originally Posted by theducks

I think the extension was chosen so it would NOT be associated with any other program. In essence, it is a BAK file and I know of no other program that opens BAK files.

no - in essence it is a properly formatted EPUB - its not a backup format, it is just a renamed file - that is why rename, then Open with sigil works fine.

but FYI, programs that open proper "backup format" files include Word, Excel...