add some helpful overloads to HawkFile for working with known filenames, instead of just extension lists

BizHawk.MultiClient/HawkFile.cs

@@ -207,6 +207,35 @@ namespace BizHawk.MultiClient
 			return fn.Replace('\\', '/');
 		}
 
+		/// <summary>
+		/// binds the specified ArchiveItem which you should have gotten by interrogating an archive hawkfile
+		/// </summary>
+		public HawkFile BindArchiveMember(ArchiveItem item)
+		{
+			return BindArchiveMember(item.index);
+		}
+
+		/// <summary>
+		/// finds an ArchiveItem with the specified name (path) within the archive; returns null if it doesnt exist
+		/// </summary>
+		public ArchiveItem FindArchiveMember(string name)
+		{
+			foreach (var ai in ArchiveItems)
+				if (ai.name == name)
+					return ai;
+			return null;
+		}
+
+		/// <summary>
+		/// binds a path within the archive; returns null if that path didnt exist.
+		/// </summary>
+		public HawkFile BindArchiveMember(string name)
+		{
+			var ai = FindArchiveMember(name);
+			if (ai == null) return null;
+			else return BindArchiveMember(ai);
+		}
+
 		/// <summary>
 		/// binds the selected archive index
 		/// </summary>