How can you convert an FLV file into a WMV file?

Download an flv converter. You can try this program: Aunsoft FLV Converter. It can convert FLV to WMV, AVI, MPEG, MOV, MP4, etc. After converting, you can view the output videos with your portable devices, such as iPod, iPhone, PSP, Blackberry, Zune or mobile. For more information, visit: http://www.aunsoft.com/flv-converter/

For converting flv to avi, mpeg, etc. I use FLV to AVI MPEG WMV 3GP MP4 iPod Converter

http://www.flash-video-soft.com/flv-to-video/

This software easily can convert these files. I use it for a long time and I haven't any problem with it. You can try it too.