I have used Filezilla for many years; mainly across many Windows machines of both the client and server platform and I've never encountered any issues.
I'm strongly liaised with the lead developer of Filezilla, and have been for a while and I'm positive that there aren't any flaws out with the latest release of Filezilla.
There was an issue a while back with FP if I can recall it correctly. I'm unsure of the specifics but a quick forum search of Frontpage could bring it up.
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