It has always been a golden rule of computing to never use period in the filename. It's just one of those things you don't do. Make it a habit to use underscore instead.
A period signals that what comes after is the file extension.
Often you can get away with it because Windows is smart enough to count backwards, stopping at the last period. But if, say, you have set Windows to hide file extensions, as many do, things go wrong. Just don't do it.
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