. They are placeholder names generated by PDF-creating software when the original fonts are not properly embedded. What are CIDFont F1, F2, F3, and F4?
If you have ever opened a PDF file from a government agency, a CAD software (like AutoCAD or Revit), or an older Japanese or Chinese document, you might have encountered a frustrating error message: "Cannot find or create font 'CID+F1'" or "Font 'F2' is missing." cid font f1 f2 f3 f4 free download link
These .msi files are for Windows and require an existing Adobe product license (free Reader qualifies). They will not install on macOS without workarounds. cid font f1 f2 f3 f4 free download link
Even if you install a font named "F1," it likely won't match the character map of your specific document. cid font f1 f2 f3 f4 free download link