Import this maps to unreal engine

hi,

i have found a folder with maps i wanted to look at on my pc. Its from an old mmorpg which is shut down now for quite some time. Problem is that they have .nif and .qmb(one .nif and one .qmp for each map) endings which unreal engine cant open.Exeen nifscope cant open them but evrything else like trees character ect. works fine with it. Has someone an idea how i can open them?

If someone want here are 2 example-files of the folder(click on the download button under the file-information not on the left of it):