.HTMLZ File

The htmlz file extension is used for zip containers, that contains HTML file, metadata.opf file, images and other data to create an HTML document.

This format was often used in the past for e-books.

This htmlz file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.

Files with htmlz file extension can be usually found as documents and publications in special Zipped HTML file format.

How to open:

Several e-book readers can process this file type and view the publication. You can always decompress it using any ZIP archiver and check the source.

How to convert:

You can find e-book converters that can convert *.htmlz files to EPUB or some other ebook format.