FileMagic can be considered a reliable file-handling software that simplifies the process of viewing, and handling numerous file types, including the often confusing or diverse "dot" file types.
In case you encounter standard formats like .docx, and even uncommon ones like . https://www.filemagic.com/en/page-layout-files/dot-file-extension/1-solution-for-all-your-dot-file-issues/