diff --git a/offline-minecraft-launcher.py b/offline-minecraft-launcher.py
index 0803682..3cb33a3 100644
--- a/offline-minecraft-launcher.py
+++ b/offline-minecraft-launcher.py
@@ -124,6 +124,8 @@ def checkRules(ruleList):
 			if "arch" in rule["os"]:
 				if lv["jvmArch"] != rule["os"]["arch"]: continue
 			
+			if "version" in rule["os"]: continue
+			
 			action = rule["action"]
 	
 	return action
@@ -133,9 +135,10 @@ def processVersion(versionsPath,libraryPath,nativePath,version):
 	clientJson = readJsonFile(p(versionPath,version + ".json"))
 	libraries = []
 	arguments = []
+	jvmArguments = []
 	
 	if "inheritsFrom" in clientJson:
-		_,libraries,arguments = processVersion(versionsPath,libraryPath,nativePath,clientJson["inheritsFrom"])
+		_,libraries,arguments,jvmArguments = processVersion(versionsPath,libraryPath,nativePath,clientJson["inheritsFrom"])
 	
 	for library in clientJson["libraries"]:
 		l = {}
@@ -160,6 +163,7 @@ def processVersion(versionsPath,libraryPath,nativePath,version):
 					l["filePathOS"] = p(nativePath,native["path"].replace("/",os.path.sep))
 					if "url" in native and native["url"] != "":
 						l["url"] = native["url"]
+					libraries.append(l)
 				
 				native = False
 				if "natives-" +lv["osName"] in library["downloads"]["classifiers"]:
@@ -181,16 +185,33 @@ def processVersion(versionsPath,libraryPath,nativePath,version):
 		libraries.append({"type":"client","filePathOS":p(versionPath,version + ".jar")})
 	
 	if "arguments" in clientJson:
-		for arg in clientJson["arguments"]["game"]:
-			if type(arg) != str: continue
-			arguments.append(arg)
+		if "game" in clientJson["arguments"]:
+			for arg in clientJson["arguments"]["game"]:
+				if type(arg) != str: continue
+				arguments.append(arg)
+		if "jvm" in clientJson["arguments"]:
+			for arg in clientJson["arguments"]["jvm"]:
+				if type(arg) != str:
+					if "value" in arg:
+						if type(arg["value"]) != list:
+							arg["value"] = [arg["value"]]
+						
+						if "rules" in arg:
+							if checkRules(arg["rules"]) == "allow":
+								for value in arg["value"]:
+									jvmArguments.append(value)
+						else:
+							for value in arg["value"]:
+								jvmArguments.append(value)
+				else:
+					jvmArguments.append(arg)
 	elif "minecraftArguments" in clientJson:
 		margs = clientJson["minecraftArguments"].replace('"',"").split(" ")
 		for arg in margs:
 			if type(arg) != str: continue
 			arguments.append(arg)
 	
-	return clientJson,libraries,arguments
+	return clientJson,libraries,arguments,jvmArguments
 
 def main():
 	print("Reading config...")
@@ -242,7 +263,7 @@ def main():
 	versionsPath = p(lv["gamePath"],"versions")
 	libraryPath = p(lv["gamePath"],"libraries")
 	nativePath = p(lv["gamePath"],"natives")
-	clientJson,libraries,arguments = processVersion(versionsPath,libraryPath,nativePath,lv["version"])
+	clientJson,libraries,arguments,jvmArguments = processVersion(versionsPath,libraryPath,nativePath,lv["version"])
 	
 	versionPath = p(lv["gamePath"],"versions",lv["version"])
 	nativesOutPath = p(versionPath,"natives-" +lv["osName"]+ "." +lv["jvmArch"])
@@ -294,15 +315,36 @@ def main():
 	launcherVariables["auth_uuid"] = hashlib.md5(lv["name"].encode('utf-8')).hexdigest()
 	launcherVariables["user_type"] = "offline"
 	launcherVariables["version_type"] = clientJson["type"]
+	launcherVariables["natives_directory"] = nativesOutPath
+	launcherVariables["launcher_name"] = "offline-minecraft-launcher"
+	launcherVariables["launcher_version"] = "0.0"
+	launcherVariables["classpath"] = libraryList
 	
 	# legacy:
 	launcherVariables["game_assets"] = assetsPath
 	launcherVariables["auth_session"] = "-"
 	
-	args = json.loads(lv["jvmArguments"])
-	args.append("-Djava.library.path=" +nativesOutPath)
-	args.append("-cp")
-	args.append(libraryList)
+	# JVM arguments:
+	args = []
+	
+	djavaFound = False
+	cpFound = False
+	for arg in jvmArguments:
+		if arg.startswith("-Djava-library.path="): djavaFound = True
+		if arg == "-cp": cpFound = True
+	
+	if djavaFound == False:
+		args.append("-Djava.library.path=" +nativesOutPath)
+	
+	if cpFound == False:
+		args.append("-cp")
+		args.append(libraryList)
+	
+	for arg in jvmArguments:
+		for var in launcherVariables:
+			arg = arg.replace("${" +var+ "}",launcherVariables[var])
+		args.append(arg)
+	args = args + json.loads(lv["jvmArguments"])
 	args.append(clientJson["mainClass"])
 	
 	for arg in arguments: