Ddf extension is associated with Photodisc -acdsee database. You can try to open ddf files with Acdsee software.
The operations which are performed by Acdsee software are saved in ddf files. If you feel that acdsee software is getting slower, you can easily delete .dtf files or the other related files. You have chance to download ddf files via various web pages that allow you to get it free. Besides, you can get detailed information from the following link below.
What to use ddf
which page related to ddf file
ddf Related Searches
You can check related links about ddf fileextension.