[DNSB]

Originally Posted by optoabhi

Image removed to avoid attracting moderator attention.

Well the imported books shows all formats (epub, mobi, opf, txt, etc.) but the Delete option only recognizes Epub or generic ebook formats, as you can see it clearly is ignoring the *.opf books.

Umm.. opf is not an ebook format -- it is an Open Packaging Format file that stores information about an ebook such as title, creator, book id, etc.. As for the rest, I've attached a snip with various formats (thanks to Baen who still support older formats). It does show a .txt file correctly after it was imported. Sample metadata.opf file is in the spoiler tag.

Spoiler:

<?xml version='1.0' encoding='utf-8'?>
<package xmlns="http://www.idpf.org/2007/opf" unique-identifier="uuid_id" version="2.0">
    <metadata xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:opf="http://www.idpf.org/2007/opf">
        <dc:identifier opf:scheme="calibre" id="calibre_id">6722</dc:identifier>
        <dc:identifier opf:scheme="uuid" id="uuid_id">63ad4fc9-38e6-49ff-bd21-ffdeb6119b34</dc:identifier>
        <dc:title>Lorem Ipsum Test</dc:title>
        <dc:creator opf:file-as="Pseudonym, Ima" opf:role="aut">Ima Pseudonym</dc:creator>
        <dc:contributor opf:file-as="calibre" opf:role="bkp">calibre (3.44.0) [https://calibre-ebook.com]</dc:contributor>
        <dc:date>0101-01-01T00:00:00+00:00</dc:date>
        <dc:language>eng</dc:language>
        <meta content="{&quot;Ima Pseudonym&quot;: &quot;&quot;}" name="calibre:author_link_map"/>
        <meta content="2019-05-21T07:00:00+00:00" name="calibre:timestamp"/>
        <meta content="Lorem Ipsum Test" name="calibre:title_sort"/>
        <meta name="calibre:user_metadata:#mm_annotations" content="{&quot;name&quot;: &quot;Annotations&quot;, &quot;is_csp&quot;: false, &quot;column&quot;: &quot;value&quot;, &quot;kind&quot;: &quot;field&quot;, &quot;display&quot;: {}, &quot;search_terms&quot;: [&quot;#mm_annotations&quot;], &quot;is_multiple2&quot;: {}, &quot;category_sort&quot;: &quot;value&quot;, &quot;#extra#&quot;: null, &quot;colnum&quot;: 2, &quot;is_multiple&quot;: null, &quot;label&quot;: &quot;mm_annotations&quot;, &quot;link_column&quot;: &quot;value&quot;, &quot;datatype&quot;: &quot;comments&quot;, &quot;rec_index&quot;: 23, &quot;#value#&quot;: null, &quot;table&quot;: &quot;custom_column_2&quot;, &quot;is_category&quot;: false, &quot;is_custom&quot;: true, &quot;is_editable&quot;: true}"/>
        <meta name="calibre:user_metadata:#author_sort" content="{&quot;name&quot;: &quot;Author Sort&quot;, &quot;is_csp&quot;: false, &quot;column&quot;: &quot;value&quot;, &quot;kind&quot;: &quot;field&quot;, &quot;display&quot;: {&quot;description&quot;: &quot;&quot;, &quot;make_category&quot;: false, &quot;use_decorations&quot;: 0, &quot;contains_html&quot;: false, &quot;composite_sort&quot;: &quot;text&quot;, &quot;composite_template&quot;: &quot;{author_sort}&quot;}, &quot;search_terms&quot;: [&quot;#author_sort&quot;], &quot;is_multiple2&quot;: {}, &quot;category_sort&quot;: &quot;value&quot;, &quot;#extra#&quot;: null, &quot;colnum&quot;: 1, &quot;is_multiple&quot;: null, &quot;label&quot;: &quot;author_sort&quot;, &quot;link_column&quot;: &quot;value&quot;, &quot;datatype&quot;: &quot;composite&quot;, &quot;rec_index&quot;: 22, &quot;#value#&quot;: &quot;Pseudonym, Ima&quot;, &quot;table&quot;: &quot;custom_column_1&quot;, &quot;is_category&quot;: false, &quot;is_custom&quot;: true, &quot;is_editable&quot;: true}"/>
    </metadata>
    <guide>
        <reference href="cover.jpg" title="Cover" type="cover"/>
    </guide>
</package>