1.   Black says the Dallas Film Commission keeps its picture files indefinitely.

2.   Can produce huge, rich picture files.

3.   I cannot open JPEG picture files now because they are all associated with the uninstalled Adobe program.

4.   Or there are the .CHK files that are often generated by disk-repair utilities, or the .GIF picture files your browser automatically saves in a cache.

5.   This allows you to click directly on a picture file, for example, and have it come up in a picture-editing program.