Obj files not showing up for imoprt

Hi, i have been using Fluid Importer to importer .obj files for a while now with no issues. Recently, i have not been able to get the obj files to import… when i go to import them from my downloads folder they are not there… but they are there in my folder. But importer is not recognizing them. I had recently right clicked on one of my obj files and chose to open it with skechup… but they are not sketchup files… now every obj file i import is showing up as a sketchup file… and i dont know if this is the reason and i dont know how to undo it and get things back to normal. Can someone please help me!