When there are .png files in the data section of a workspace, clicking on it pulls up a "preview" of the file which looks like the attached screenshot. Unfortunately generating this preview takes a noticeably long time (on the order of a several full seconds), which wouldn't be a problem, except that you can't open the file by clicking the Open button until after the preview has loaded.
The preview should either be avoided when the file extension is clearly an image, or at the very least the Open button should be available before the preview loads.