Delphi Unknown picture file extension (.jpg) 错误提示

在用TOpenPictureDialog打开jpg图片时总是有如下错误，并且在瞬间很难发现错误原因：
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Debugger Exception Notification
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Project Project1.exe raised exception class EInvalidGraphic with message 'Unknown picture file extension (.jpg)'.
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解决办法：uses JPEG;