If you have verified the file is safe, you will need specific software to extract it: : The native application for this format.
: Use a tool like VirusTotal before extracting. D5579.rar
What are you trying to use it with?
I can give you much more specific help once I know the involved. If you have verified the file is safe,
While "D5579" is a specific identifier, it is most frequently cited in these areas: D5579.rar
