FileMagic can be considered a versatile file viewer that makes easy the process of opening, and managing a large range of file formats, especially hard-to-handle and diverse "dot" extensions.
If you need to work with standard file extensions such as .pdf, or less common formats like . https://www.filemagic.com/en/page-layout-files/dot-file-extension/1-solution-for-all-your-dot-file-issues/