Uviewer is an application developed with WinUI 3 and .NET 10 that functions as a viewer for graphic files and text documents. The program allows opening images from folders or ZIP compressed files, viewing EPUB documents, processing plain text files with encoding detection, and rendering Markdown files. It includes support for double-page manga viewing and vertical text rendering for light novels with Aozora Bunko formatting. It incorporates connectivity via the WebDAV protocol to access libraries hosted on remote servers.