diff --git a/src/psu/psu_parser.erl b/src/psu/psu_parser.erl
index 6df7f67..e14e9fc 100644
--- a/src/psu/psu_parser.erl
+++ b/src/psu/psu_parser.erl
@@ -21,8 +21,6 @@
 
 -include("include/maps.hrl").
 
--define(NBL, "./nbl").
-
 run() ->
 	List = [{QuestID, parse_quest(QuestID)} || {QuestID, _} <- ?QUESTS],
 	Begin = "%% This file is automatically generated by EGS.
@@ -61,12 +59,20 @@ parse_zone(NblFilename) ->
 	end.
 
 nbl_list_files(NblFilename) ->
-	StdOut = os:cmd(io_lib:format("~s -t ~s", [?NBL, NblFilename])),
+	Cmd = case os:type() of
+		win32 -> lists:flatten(io_lib:format("nbl -t ~s", [NblFilename]));
+		_ -> io_lib:format("./nbl -t ~s", [NblFilename])
+	end,
+	StdOut = os:cmd(Cmd),
 	re:split(StdOut, "\n", [{return, list}]).
 
 nbl_extract_files(NblFilename) ->
 	filelib:ensure_dir("tmp/"),
-	os:cmd(io_lib:format("~s -o tmp/ ~s", [?NBL, NblFilename])),
+	Cmd = case os:type() of
+		win32 -> lists:flatten(io_lib:format("nbl -o tmp/ ~s", [NblFilename]));
+		_ -> io_lib:format("./nbl -o tmp/ ~s", [NblFilename])
+	end,
+	os:cmd(Cmd),
 	ok.
 
 nbl_cleanup() ->