Ultra AVI joiner currently is the best AVI joiner, which can join AVI video files perfectly. with this AVI joiner, you can also join AVI with other video formats together,such as join MPEG, WMV, RM, MP4 with AVI, this AVI file joiner also support join video files to VCD/SVCD/DVD image files, and then you burn them into your VCD/SVCD/DVD disk. with this AVI joiner you can even convert video files to other video formats you want.
Guide: How to use the AVI Video Joiner to join video files Step 1: 
Free download AVI Joiner and install it on your computer.
Step 2:Click 
Button to select the video files you want to join
Step 3: You can edit the source video files, if you need or just would like.
Click on the source file you want to edit, Click
button to edit the selected file, you can set the start time and the end time, as the following picture :
Step 4: Sepcify the directory for output files by clicking the 'Change...' button, or just use the default directory (Note: after successful join, pls click Open button to find where the file stored, if u try to find the converted file via other way, you may can not see the joined file)
Step 5: Sepcify other settings for advanced user, you can set output quality, frame rate, TV type, Aspect Ratio, Add letterbox and so on.
Step 6: Click
Button to join the AVI video files.
After successful join AVI video files, the joined video files shall be stored in the folder you have previously selected. Download free version
Convinced? 
Buy full version $25 now.