ShellEx 2.3: No context menu for BMP

[Enmoku]

Screenshots taken in Mass Effect (UE3 engine) are somehow unrecognized by the Shell Extension (the explorer context menu is missing). I hear Photoshop has a problem with these as well, but XnView itself (and MSPaint) seems to ignore whatever it is and works fine with them.

Uploaded one such image here:
http://darkeraspect.googlepages.com/ScreenShot00010.bmp (3.88MB, mind)

[xnview]

Ok, there is a read error