Maybe you haven't noticed, but Windows Explorer doesn't show the exact size of a file in the Size column. Instead, it rounds the size to the nearest kilobyte. For example, a 203 byte file is listed as 1 KB. To find the exact size of the file, select it and check the Status Bar. The exact size is displayed in the Status Bar. If the Status Bar isn't displayed, choose View | Status Bar to show it.
Source: Christine Spencer
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