: An obsolete German math program used .015 for Julia Fractal files. Recommended Software Recommended Tool Windows 7-Zip (Official), WinZip , PeaZip macOS The Unarchiver , Keka Linux p7zip Mobile iZip (iOS), 7Zipper (Android)
Do you have of the archive (starting from .001), or are you missing some files in the sequence? 7Z file extension - PeaZip 015 7z
A file with a extension alongside .7z typically indicates the 15th part of a multi-volume (split) archive created by the 7-Zip software. : An obsolete German math program used