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Doc Format
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The DOC file type is primarily associated with 'Word' by Microsoft Corporation.
Office Word is an authoring program that gives you the ability to create and share documents using a set of writing tools.
Different versions of Word may have slightly different initial file contents. Use TrID to determine the version of Word.
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ePub Format:
The unzipped EPUB files may be divided into three categories: XHTML documents, packaging files and container files.
XHTML Documents. XHTML is a strict version of HTML. The stricter syntax enables reading systems to render documents more easily. This was important for devices with limited computing power. However, modern tablets and smartphones can all read regular HTML.
Packaging Files. They include two files: one with the .opf extension and another with the .ncx extension. The .opf file contains book information (author, publisher, etc.) and a list of all files in the book package. The .ncx file tells the sequence and organization (parts, chapters or sections) of XHTML documents in a book.
Container Files. They must be placed in a folder named "META-INF". These files are used for encryption and digital rights management (DRM). For an eBook without DRM, the container file has only a few standard lines.
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