Need Help merging two video files together

hi i am sorry if this is in the wrong place but i thought that it was suitable, ok now i would like to merge two video files together but i dont know what type of files they are can someone help me with this, here is a picture of what two video files i am trying to merge together,

Please HELP ME

 

Open up the folder.
At the top click 'Tools' > 'Folder Options' > 'View' then uncheck 'Hide Extensions of Known File Types' > 'OK'.

If they are .AVI files you can find which codecs are needed by using GSpot.
Drag the AVI on to GSpot and try to see which codec it needs and if it's installed on the PC.
In the example, the codec is XviD and it's installed.
You can also try to play the file using the buttons.
http://www.headbands.com/gspot/v26x/GSpot270a.zip

 

ok mine is SDX50 and the codecs are not installed

 

sorry it is DX50

 

DivX codec,look here for free download.

http://www.divx.com/divx/windows/

 

never mind but i am using Allok Video Joiner and it works great! thanks for your help though