Kindle wants mobi files or the encryption capable equivalent e.g. azw, azw3.
I'd suggest that Kindle for PC v1.17 is a better choice as it predates the more secure PITA KFX encryption. So if you use the older version, Amazon will send it the old format, non-KFX files instead. For actual file conversion, gather the appropriate plug-ins and use Calibre, which can auto convert books upon import.
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