Answers.Body: <p>A true EPUB file <em>is</em> a zipped archive, <a href="https://www.altova.com/blog/learning-about-epub-structure-and-content/" rel="nofollow noreferrer">containing multiple components</a>, as shown below:</p>
  <p><a href="https://i.sstatic.net/YPMpGux7.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/YPMpGux7.png" alt="EMPUB file in 7-Zip" /></a></p>
  <p>Whatever application created the folder had not yet zipped it. That seems a bit odd, since modern devices can handle zip archives <em>very</em> rapidly, but, as you discovered, those folders can easily be zipped.</p>
  <p>Many other modern document file types are similar zipped archives, such as MS Word's DOCX, LibreOffice Calc's ODS and Impress's ODP, etc.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2024-09-06T01:40:28.713Z
Answers.LastActivityDate: 2024-09-06T01:40:28.713Z
Answers.UserDisplayName: DrMoishe Pippik
Body: <p>I have a large collection of epub books. I’m trying to make a few changes using a package called Magic (derived from Sigil), but I’ve discovered that it won’t open some books.</p>
  <p>It seems that some of the epubs are actually folders, and neither Magic nor Sigil likes that.</p>
  <p>If I zip the folder and rename it to <code>.epub</code>, it works, so I can do the following:</p>
  <ul>
  <li>zip the folder <code>test.epub</code> to <code>test.zip</code></li>
  <li>delete the <code>test.epub</code> folder</li>
  <li>rename the <code>test.zip</code> file to <code>test.zip</code></li>
  </ul>
  <p>It works, but I wonder whether there’s a utility which will do that for me?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2024-09-02T09:24:22.390Z
Comments.Text: Not an answer but how were those folders created they are not epub books. This is a very unusual setup so I doubt there is any tool for this.
Comments.UserDisplayName: mmmmmm
Tags: <epub>
Title: Convert epub folder to epub file
UserDisplayName: Manngo
ThreadText: # Convert epub folder to epub file
  
  (Asked by: username_0 on 2024-09-02)
  
  I have a large collection of epub books. I’m trying to make a few changes using a package called Magic (derived from Sigil), but I’ve discovered that it won’t open some books.
  
  It seems that some of the epubs are actually folders, and neither Magic nor Sigil likes that.
  
  If I zip the folder and rename it to `.epub`, it works, so I can do the following:
  
  * zip the folder `test.epub` to `test.zip`
  * delete the `test.epub` folder
  * rename the `test.zip` file to `test.zip`
  
  It works, but I wonder whether there’s a utility which will do that for me?
  
  **Tags:** epub
  
  > **Comments:**
  > **username_1**: Not an answer but how were those folders created they are not epub books. This is a very unusual setup so I doubt there is any tool for this.  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2024-09-06. Score: 1
  
  A true EPUB file *is* a zipped archive, [containing multiple components](https://www.altova.com/blog/learning-about-epub-structure-and-content/), as shown below:
  
  [![EMPUB file in 7-Zip](https://i.sstatic.net/YPMpGux7.png)](https://i.sstatic.net/YPMpGux7.png)
  
  Whatever application created the folder had not yet zipped it. That seems a bit odd, since modern devices can handle zip archives *very* rapidly, but, as you discovered, those folders can easily be zipped.
  
  Many other modern document file types are similar zipped archives, such as MS Word's DOCX, LibreOffice Calc's ODS and Impress's ODP, etc.
  
  
  ---
  
  