Does .scr virus only infect word documents? or do they also infect other files like photos, videos & etc.?

does .scr virus only infect word documents? or do they also infect other files like photos, videos & etc.?

my laptop is infected with .scr virus, im planning to reformat it,, do other files or data are also infected with this virus? is it possible to backup my photos,videos and etc.? thanks in advance..
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