I think the SshHostKeys are now stored in HKCU\Software\SimonTatham\PuTTY rather than HKCU\Software\FileZillaPo\PuTTY\SshHostKeys & if the connection dialog is cancelled (without accepting the keys) then the file %LOCALAPPDATA%\PUTTY.RND is left behind.
XP SP3 admin, connecting to sourceforge
This was partially fixed in the next release. The registry issue was anyway. I'll need to post an update to remove the putty.rnd file.
Sometimes, the impossible can become possible, if you're awesome!
The file is now contained within FileZilla Portable in the 3.7.1.1 Rev 2 release.
Sometimes, the impossible can become possible, if you're awesome!