As already pointed out in my previous posts, this is bad by design. The AVI file is just a container around a raw video stream. By changing the FourCC code in the AVI header, the Linksys engineers intentionally force you to use their (Windows-only) NVR player to view the file, while this could be perfectly done in ANY player that supports the compression format of the recorded camera stream.
The good news is that by simply correcting the FourCC code in the hader, the file becomes playable and you can work around the vendor lockin idea of Linksys,