Steroscopic fotos can be stored in jpe-files with the file-extension jps.
By adding jps to the list of allowed file types stereoscopic content can be uploaded to commons to build a stock of 3d images for the future when wikipedia hopefully will be able to show 3d images.
There is a set of about 2000 stereoscopic images for testing purposes on commons, that can be renamed to the file extension jps.
I entered a way to use 3d images in wikipedia in the last tech wishlist survey, and I am going to do it again in the next tech wishlist survey. With the file extension jps enabled this would be easier.