When downloaded file exists, but is not linked, and is downloaded, it does not work

[koppor]

1. BibEntry without file
2. Winery - Winery a Modeling Tool for TOSCA Based Cloud Applications.pdf exists.
3. Click on the glasses leads to
4. BibTeX afterwards - why is there a URL as file name

@InProceedings{Winery,
  author    = {Oliver Kopp and others},
  booktitle = {Proceedings of 11\textsuperscript{th} International Conference on Service-Oriented Computing (ICSOC'13)},
  title     = {{Winery -- A Modeling Tool for {TOSCA}-based Cloud Applications}},
  year      = {2013},
  pages     = {700--704},
  publisher = {Springer Berlin Heidelberg},
  series    = {LNCS},
  volume    = {8274},
  doi       = {10.1007/978-3-642-45005-1_64},
  file      = {:https\://link.springer.com/content/pdf/10.1007%2f978-3-642-45005-1_64.pdf:PDF},
  keywords  = {Cloud Applications; Modeling; TOSCA; Management; Portability},
}