What program opens the following File Extension

If you want to open a particular file but realise that you don´t have the correct program to open it then you will have to know which file extension it is.
To view this go to the Properties (by Right-clicking the file) and see what extension or file type it is eg: .doc.
when you know this you can go to :
http://www.uktsupport.co.uk/reference/fext/fexta1.htm
Find the file type extension and see which program can open it ,then all you need to do is to get that program.