diff --git a/tools/regconvert.py b/tools/regconvert.py
index fdc1090b67..287cc13720 100755
--- a/tools/regconvert.py
+++ b/tools/regconvert.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 
 import argparse
+import re
 
 GROUP_SIZE = 0x60
 DATA_OFFSET = 0x14
@@ -11,13 +12,96 @@ def get_reg_macro(offset):
     reg = (offset - DATA_OFFSET) // 2
     group = reg // GROUP_SIZE
     reg_in_group = reg % GROUP_SIZE
-    return "%cREG(%d)\n" % (REGISTER_NAMES[group], reg_in_group)
+    return "%cREG(%d)" % (REGISTER_NAMES[group], reg_in_group)
+
+def parse_number(string, force_hex):
+    if string.lower().startswith("0x") or force_hex:
+        return int(string, 16)
+    return int(string, 0)
+
+def index_to_offset(index):
+    return index * 2 + DATA_OFFSET
+
+def read_file(filename):
+    parsed_contents = ""
+
+    src_file = open(filename)
+    file_contents = src_file.read()
+    src_file.close()
+
+    pattern = re.compile("gGameInfo->data\[((0[xX])?[0-9a-fA-F]+)\]")
+
+    match = pattern.search(file_contents)
+    while match:
+        index = parse_number(match.group(1), False)
+        offset = index_to_offset(index)
+
+        start, end = match.span()
+        parsed_contents += file_contents[:start]
+        parsed_contents += get_reg_macro(offset)
+
+        file_contents = file_contents[end:]
+        match = pattern.search(file_contents)
+    
+    parsed_contents += file_contents
+    return parsed_contents
+
+def write_file(filename, contents):
+    with open(filename, "w") as f:
+        f.write(contents)
+
+def check_valid_index(index):
+    return 0x0 <= index <= 0xADF
+
+def check_valid_offset(offset):
+    return 0x14 <= index <= 0x15D2
 
 def main():
-    parser = argparse.ArgumentParser(description="Converts a GameInfo offset to a REG macro.")
-    parser.add_argument("offset", help="offset to GameInfo in hexadecimal")
+    parser = argparse.ArgumentParser(description="Converts a gGameInfo->data index to a REG macro.")
+
+    # TODO: Add a description and a better title
+    # index_group = parser.add_argument_group(title="index", description="")
+    index_group = parser.add_argument_group()
+    index_group.add_argument("index", help="index of gGameInfo->data in decimal (or hexadecimal if starts with 0x)")
+    index_group.add_argument("--offset", help="treat index argument as an offset to gGameInfo instead", action="store_true")
+    index_group.add_argument("--hex", help="treat index argument as hexadecimal, even without the 0x", action="store_true")
+
+    # TODO: Add a description and a better title
+    # file_group = parser.add_argument_group(title="file", description="")
+    file_group = parser.add_argument_group()
+    file_group.add_argument("--file", help="use the parameter as a filepath, then replace every occurrence of `gGameInfo->data[number]` in that file a REG macro", action="store_true")
+    file_group.add_argument("--stdout", help="print the processed file to stdout instead of overwriting the original", action="store_true")
     args = parser.parse_args()
-    print(get_reg_macro(int(args.offset, 16)))
+
+    if args.file:
+        filename = args.index
+        contents = read_file(filename)
+        if args.stdout:
+            print(contents)
+        else:
+            write_file(filename, contents)
+    else:
+        index = parse_number(args.index, args.hex)        
+        if args.offset:
+            offset = index
+            if not check_valid_offset(offset):
+                print("Invalid offset: " + args.index)
+                if args.hex:
+                    print("Offset should be in the range from 0x14 to 0x15D2")
+                else:
+                    print("Offset should be in the range from 20 to 5586")
+                exit(-1)
+        else:
+            if not check_valid_index(index):
+                print("Invalid index: " + args.index)
+                if args.hex:
+                    print("Index should be in the range from 0x0 to 0xADF")
+                else:
+                    print("Index should be in the range from 0 to 2783")
+                exit(-1)
+            offset = index_to_offset(index)
+
+        print(get_reg_macro(offset)+"\n")
 
 if __name__ == "__main__":
     main()