If you are having problems opening up SHX files, you may need to download SHX - AutoCAD Compiled Shape File as an extension. This type of extension is associated most commonly with computer aided drafting software programs. They also contain shape files that have been made for use with this program. You will be able to compile these files from either SHP shape or PFB font files. They are mostly used by AutoCAD. They also consist of shape and font definitions. This extension really comes in handy if you need something that can display custom text designs and do a lot more. The designs are created depending on what you as a user is creating. You will be able to gain access to this file extension download by going online.