diff --git a/extract.py b/extract.py
index adda7d9..e6e886d 100644
--- a/extract.py
+++ b/extract.py
@@ -14,27 +14,38 @@ def main():
     logger.addHandler(_ch)
     logger.setLevel("DEBUG")
     parser = argparse.ArgumentParser()
-    parser.add_argument("map_file")
+    parser.add_argument("map_file", help="map file, or bin if you also use --bin")
+    parser.add_argument("--bin", action="store_true", help="use this if the file is already a .bin file")
     args = parser.parse_args()
 
     map_file = args.map_file
-    logger.info("Opening %s", map_file)
-    zip_file = zipfile.ZipFile(map_file)
-    files = zip_file.namelist()
-    bin_filename = None
-    for file in files:
-        logger.info("Found file %s", file)
-        if file.endswith(".bin"):
-            bin_filename = file
-            logger.info("Found BIN file %s", bin_filename)
-            break
-    if not bin_filename:
-        logger.error("FATAL: BIN file not found")
-        zip_file.close()
-        exit(1)
 
+    _fh = logging.FileHandler(args.map_file+".log")
+    _fh.setFormatter(_formatter)
+    logger.addHandler(_fh)
+
+    if not args.bin:
+        logger.info("Opening %s", map_file)
+        zip_file = zipfile.ZipFile(map_file)
+        files = zip_file.namelist()
+        bin_filename = None
+        for file in files:
+            logger.info("Found file %s", file)
+            if file.endswith(".bin"):
+                bin_filename = file
+                logger.info("Found BIN file %s", bin_filename)
+                break
+        if not bin_filename:
+            logger.error("FATAL: BIN file not found")
+            zip_file.close()
+            exit(1)
+
+        fp = zip_file.open(bin_filename)
+    else:
+        bin_filename = args.map_file
+        fp = open(bin_filename, "rb")
     logger.info("Opening %s", bin_filename)
-    with zip_file.open(bin_filename) as bin_file:
+    with fp as bin_file:
         byte = bin_file.read(1)
         while byte != b"":
             if byte == b'\x2a':  # start object
@@ -47,7 +58,8 @@ def main():
                 objects.append({"model": model, "x": x, "y": y, "z": z, "angle": angle})
                 logger.info("Object model=%s x=%s y=%s z=%s angle=%s", model, x, y, z, angle)
             byte = bin_file.read(1)
-    zip_file.close()
+    if not args.bin:
+        zip_file.close()
 
     logger.info("Number of objects: %s", len(objects))
     models_count = {}