Ultra WMV video joiner currently is the best WMV joiner, which can join WMV video files perfectly. with this WMV joiner, you can also join WMV with other video formats together,such as join MPEG, AVI, RM, MP4 with WMV, this WMV 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 WMV joiner you can even convert video files to other video formats you want.
Allok WMV Video Joiner is a powerful tool to join multiple WMV, MP4, RM, AVI, Divx, XviD, MPEG, ASF, MOV, 3GP files into one large file. It also supports join WMV video files to VCD/SVCD image and DVD-Video files, so you can burn them into one VCD/SVCD/DVD disc easily by using third-party buring tools. as the operation of Ultra WMV video joiner is simillar with Allok WMV video joiner, so I only list the guide of How to use Allok WMV video joiner
Guide: How to use Allok WMV Video Joiner Step 1: 
Free download WMV Joiner and install it on your computer.
Step 2:Click 
Button to select the video files you want to join
Step 3:Edit the source WMV video files, if you like.
Click
button to edit the selected file, you can set the start time and the end time, as the following picture :
Step 3, 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 Butt
on to join the WMV video files.
After successful join WMV video files, the joined video files shall be stored in the folder you have previously selected.
Convinced? 
Get full version now.
UltraWMV Video joiner operation is quite similar as the guide above, just free download them and enjoy by youself.