What Means X Files
x means:X may be an extension of Direct X 3d files, Fps creator or Lex programming system. You can open these files with several softwares.
There are 3 different softwares that use this extension.
1- It may be a 3d modelling format that comes from Direct X SDK package.
2- It also can be FPS creator 3d modelling file. You can get detailed information from its web page.
3- It can be Lex programming system source code.
Definition softwares of X file
Meanful links for X file