First image is render setting. And second image is output file. That file should be png file but, it is not.
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$\begingroup$ Do you have a light in your scene? Do you have a camera in your scene? Please include a .blend file: blender.meta.stackexchange.com/questions/658/… Thanks! $\endgroup$– ComputerScientistJun 10, 2020 at 1:45
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$\begingroup$ yes. I have many lights and cameras. $\endgroup$– CoderJun 10, 2020 at 1:47
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$\begingroup$ Sounds good! May you include the .blend file so we can check the problem? Thanks! $\endgroup$– ComputerScientistJun 10, 2020 at 1:53
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$\begingroup$ My file is so big it won't let me upload in both website. $\endgroup$– CoderJun 10, 2020 at 2:13
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2$\begingroup$ just add a .png extension to the name. $\endgroup$– susuJun 10, 2020 at 3:24
1 Answer
Windows (and other operating systems) doesn't know what to do with files that have no file extension.
Just rename the file and the extension that corresponds with the file format (in this case .png,), so that the OS understands it is dealing with an image (or video) file and uses the appropriate program to open such file.
In the future enable the File Extensions box on the output so that you get the name with a .png (or .exr or .jpg or mp4 or whatever) extension.