It sounds like you chose a file type in the Chimera File/Open… dialog “File type” menu and now it is remember that type.  Change the Open dialog “File type” menu to “all (guess type)” to have Chimera automatically recognize the file type from the file suffix.

Tom

On Jan 4, 2017, at 6:54 PM, Tones,Jason R wrote:

Hello, I am a student and recently downloaded chimera to use for a class, when I clicked to open the DOI of a search on the protein database I picked the wrong file under chimera to use to open it and it wouldn’t open. I tried uninstalling and reinstalling and it keeps going to the file that won’t open what I’m trying to do. Thank you for any help or suggestions you may have for me.
 
Jason
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