You are trying to view a specific document that gives you an error saying "CID Font F1/F2/F3 is missing," or if you are troubleshooting a legacy printing issue.
If you only need to view or print the file and not edit the text, use the "Place" or "Passthrough" option in your design software to preserve the original visual appearance without needing the font installed. Flatten or Outline Cid Font F1 F2 F3 Free Download
If you share the exact file or software showing “F1/F2/F3,” I can help identify the real font. You are trying to view a specific document