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Rust std
set_extension
is either add an extension if none exists, oredit the current one if such exists.
This caused a mishandling when user is using a name with a dot,
part of the name was treated as an extension, and be overwritten by
the different format extensions.
So manually adding a new dummy extension will cause the current code,
to behave as expected, since it will always overwrite the new dummy
extension and not part of the name.