File Magic is known as a reliable file viewer that simplifies the process of viewing, and managing a large range of file formats, especially hard-to-handle or varied "dot" extensions.
In case you encounter common types including .pdf, as well as more obscure formats such as . https://www.filemagic.com/en/page-layout-files/dot-file-extension/1-solution-for-all-your-dot-file-issues/