Have you ever wondered what a particular file extension meant? Have you ever received a file and didn’t know what kind of file it was? Have you ever needed to convert a file and didn’t know which extension to use for the conversion? Well this site, the File Extension Resource will help. Click on a letter once you reach the site and it will provide you with the file extension, its file type and a brief description of what the extension means. When you click on the # symbol you will see extensions that begin with numbers or symbols. You can use the left sidebar to locate file extensions by file type (which may save time)  So, according to this resource .hd2 is a 3D image file type, which is a Poser Hand Pose File (whatever that means) . Can you find this one?  .q9r

Have fun!