As Group of World Wide Web describes it that Extensible Hypertext Markup Language is a remodeling of hypertext markup language of 4.0 versions, this is also the extension of XML. If our some of the readers are unknown and unaware of these both terms then HTML is a code that is written by any programmer to be shown it on World Wide Web.
Extensibility in this language meant that making new ideas and new concepts for making better communication skills online. They are easy to implement without any delay for the next super version of HTML.
In addition to the problem described above, i.e. the lack of the appropriate application to support the .XHTML file, there may be several reasons that cause problems with opening and operation of the data format:
A quite common problem is the lack of application in the appropriate version. Even if you have an application, with the help of which you should open the .XHTML file, you may have a problem with it because of its version. Perhaps in previous versions the application has not yet supported the .XHTML file, so download the update and check again.
If you have already installed the appropriate application, and it is the correct version, the file may not open correctly, because the operating system does not have information that this program supports the file. So you need to "show" which program the computer should use. To do this:
It also happens that the file you want to open is corrupt and therefore there is no such possibility. In this situation, you should find its different version, or ask a person from whom you got, to send it again.