In the interface of Pisaca, you to go to the Tools -> Options menu
In the interface new, you click on the File Types tab, BMP, GIF, PNG, TGA, TIF, TIFF, WEBP, PSD (Photoshop), RAW Formats, Movies (AVI, MPG, ASF, WMV)
And you check all the boxes you want to use for Movies (AVI, MPG, ASF, WMV).
Then click ok