If you have forgotten your username or password, you can request to have your username emailed to you and to reset your password. When you fill in your registered email address, you will be sent instructions on how to reset your password.
yes, you are correct about the J***t files. on OSX the correct extension is .caf, .aif works as well. the source of the confusion is on the Windows version; in addition to the 2 or 3 _jcfx files, there are also 2 or 3 _jcfx_d files. I believe these are generated by the app and are uncompressed versions to avoid any driver or codec issues with windows, just speculation, but people are assuming these are different files, larger files and bigger means better quality. but they are making a poor assumption.