What do you mean by 'dropping OR clicking'?

It's best to have no spaces or 'special' characters in the file name, i.e. no ?, &, <, > etc. Use the etree naming convention for best results.

While you are at it, you should upgrade to the latest flac.exe binary. It sounds to me like you are using the one packaged with the Flac Frontend you downloaded from etree.

Make sure you have flac.exe and metaflac.exe in the same directory as Flac Frontend or in your system path.