both logfile and keys.dat are located in the subdir mentioned after you use menu FILE / MANAGE KEYS .
see also:
https://bitmessage.org/forum/index.php/topic,4820.msg11163.html#msg11163
http://web.archive.org/web/20170712122006/https://bitmessage.org/forum/index.php/topic,4820.msg11163.html
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