An error that occurs when the Windows username is created using non-English characters in non-English language environments. The Readium Reader plugin runs, but it fails to load supplementary files such as images and CSS.
I'm experiencing a minor issue with the Readium Reader plugin. I'm a Korean user, and when I set my Windows username in Korean, the user folder name is also created in Korean. The Readium Reader plugin has problems when any part of the full Sigil settings folder path contains Korean characters. The plugin itself runs, but it fails to load files included in the EPUB, such as images and stylesheets. Even after inserting code to convert file paths to UTF-8, the issue was not resolved. So I fixed the problem by running a server and modifying it to work with a local URL instead. Since similar issues may occur not only with Korean but also with other CJK or non-English languages, I'm sharing the modified file.
Since it temporarily runs a web server and loads the URL in a web view, you can also open the reader in an external browser when the plugin is executed:
http://127.0.0.1:51337/viewer/cloud-...=epub_content/TEMP_FOLDER/