File-Extensions.org is described as 'The File-Extensions.org is a website focused on collecting of informations about file extensions and their associated programs, so it can provide you with any information you need about your files'. There are four alternatives to File-Extensions.org for Online / Web-based, Windows, Windows Explorer, Android and Mac. The best alternative is FileInfo.com, which is free. Other great apps like File-Extensions.org are OpenWith.org (Free), WikiExt (Free) and FileFormat.com (Free).
FileInfo.com contains a searchable database of thousands of file extensions with detailed information about the associated file types. You can use FileInfo.com to lookup information about unknown file types and find programs that open the files.
FileFormat.com is your File Format Guide. It gives comprehensive information, news, and discussions about popular File Extensions. Visitors can find Description as well as History of file formats with respect to their development phases.