The .rsdf file extension is most commonly associated with encrypted file downloads. The RSDF files contain links to files that can be downloaded from the Internet. The RSDF file format is used to save a list of downloads. This list is encrypted in order to hide the file locations from unauthorized viewers. RapidShare, Jdownloader and CryptLoad often use the RSDF file format.
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If you have additional information about the RSDF file format or software that uses files with the RSDF suffix, please do get in touch - we would love hearing from you.