UE4 suppenly have lost ability to recognise any UE4 files

I have been working on my project for a long time and suddenly I cannot import in all ways any ue4 files. Engine doest recognize any files. Week ago I could import and now I could not import same files. I don’t know what happened!! Help!!Tried open another projejct> same problem with. It happened today. Everything worked yesterday!!!

Hello,

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https://epicsupport.force.com/unrealengine/s/

Thanks