For use with https://gist.github.com/2367357 . Get font's file path by font name, requires Windows 7 (2008R2 should be OK too). Uses undocumented feature, not sure whether it still works on Win8. Compiled version: http://nmm.me/fq

GetFontPath.cs

using System;
using System.Collections.Generic;
using System.Text;
using SharpDX.DirectWrite;
using System.Reflection;
using System.Runtime.InteropServices;

namespace GetFontPath
{
    class Program
    {
        static int Main(string[] args)
        {
            if (args.Length == 0)
            {
                Console.Error.WriteLine("Usage: {0} <Font name>");
                return 1;
            }
            var factory = new Factory();
            var collection = factory.GetSystemFontCollection(true);
            int fontIndex = 0;
            var name = args[0];
            bool found = collection.FindFamilyName(name, out fontIndex);
            if (!found)
            {
                Console.Error.WriteLine("Can't find <{0}>", name);
                return 1;
            }
            var fontFamily = collection.GetFontFamily(fontIndex);
            var fileNames = new List<string>();
            for (int font_i = 0; font_i < fontFamily.FontCount; font_i++)
            {
                var font = fontFamily.GetFont(font_i);
                var fontFace = new FontFace(font);
                var fontFiles = fontFace.GetFiles();
                foreach (var file in fontFiles)
                {
                    // Can't directly use the public interface, it will throw an exception when attempting to read from the stream
                    var method = file.GetType().GetMethod("GetReferenceKey", BindingFlags.NonPublic | BindingFlags.Instance);
                    IntPtr pointer = IntPtr.Zero;
                    unsafe
                    {
                        IntPtr pptr = new IntPtr(&pointer);
                        object[] parameters = { pptr, 0 };
                        SharpDX.Result result = (SharpDX.Result)method.Invoke(file, parameters);
                        byte[] data = new byte[(int)parameters[1]];
                        Marshal.Copy(pointer, data, 0, data.Length);
                        string fileName = Encoding.Unicode.GetString(data, 8, data.Length - 10);
                        if (fileName.StartsWith("*"))
                        {
                            fileName = Environment.ExpandEnvironmentVariables(@"%SystemRoot%\Fonts\" + fileName.Substring(1));
                        }
                        if (fileNames.Find(x => StringComparer.CurrentCultureIgnoreCase.Equals(x, fileName)) == null)
                        {
                            fileNames.Add(fileName);
                        }
                    }
                }
            }
            foreach (var fileName in fileNames)
            {
                Console.WriteLine(fileName);
            }

            return 0;
        }
    }
}