My OBJ files dont open! when i select them it appears a red bar on the name of the file!! here is a photo that explains everything for me!
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This sounds like a user support question, for which you can more quickly get help at:
https://blender.community/c/rightclickselect/
https://blenderartists.org/
For a bug report, we ask for complete information and very specific steps to redo the problem:
https://developer.blender.org/maniphest/task/edit/form/2/
At the moment it is not clear to me what you are doing, and cropping the screenshot to just one line makes it harder to guess what you did.