Video support sucks...!

It seems that this app only supports MP4 format for videos. Other formats such as AVI, FLV, WMV and MKV are not supported at all. I bought this app hoping I will be able to watch my casual vids, but couldnt do it. Am I supposed to convert all my vids one by one to MP4?

Han7777777 about Air Transfer+ File Transfer from/to PC thru WiFi, v1.3.13