The previous posted comment you reported was removed as spam. They were not trying to get you to pay any money for decryption.
Any files that are encrypted with the Locky (.Osiris) ransomware variant will be renamed with random alpha-numerical characters and have the .osiris extension appended to the end of the encrypted data filename (i.e. 11111111--1111--1111--FC8BB0BA--5FE9D9C2B69A.osiris) and leave files (ransom notes) named DesktopOSIRIS.bmp, DesktopOSIRIS.htm, OSIRIS-[4_numbers].htm, OSIRIS-[4_numbers].htm as explained here.
Unfortunately, there is no known way at this time to decrypt files encrypted by Locky variants regardless of the extension without paying the ransom.
There is an ongoing discussion in this topic where you can post comments, ask questions and seek further assistance. Other victims have been directed there to share information, experiences and suggestions.
When or if a solution is found, that information will be provided in this support topic and you will receive notification if subscribed to it. In addition, a news article most likely will be posted on the BleepingComputer front page.
Rather than have everyone with individual topics, it would be best (and more manageable for staff) if you posted any more questions, comments or requests for assistance in the above support topic discussion...it includes experiences by experts, a variety of IT consultants, end users and company reps who have been affected by ransomware infections. To avoid unnecessary confusion, this topic is closed.
The BC Staff