First off all, where have you found this file? It not from original US client, moreover normal file size for dat.vdk is 2.1-2.5Mb, but not 6.7! SkillAsset.csv and some other files mby corrupted or already packed (there is no point in examining what exactly happened with this files). Original Requiem client can’t work with such dat.vdk.
for the present instance, dVDK unpacker works correctly.