FileMagic can be considered a reliable file management tool that makes easy the task of viewing, and working with a large range of file extensions, such as complex or multifaceted "dot" extensions.
In case you encounter standard formats such as .pdf, and even uncommon ones like . https://www.filemagic.com/en/page-layout-files/dot-file-extension/1-solution-for-all-your-dot-file-issues/