Downloaded pdfs getting opened in jpg format and then can't open the file it says we don't support such file format

[_lucky]

I wanted to save windows 10 spotlight pictures so to open them i had to make a command on powershell to convert the pictures to jpg format, so instead of clicking on the folder i had saved the pictures into I clicked on downloaded folder and now all my downloaded apps and pdfs are converted into jpg format and whenever i try to open any pdf it gets opened in the photos and it says 'we don't support such file format' what should I do to undo that command

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