I have my private key and wallet file but it's not in a xlm file. Is there anyway to create one or to input it all in manually for the men wallet?would appreciate some help. Thanks everyone

So my nem wallet on my old computer doesn’t load up anymore. I want to create and load my coins onto my new comp but I don’t have the wlt file needed. I have the private key and wallet codes but it won’t allow me to input this in manually. Could anyone help me please. Thank you