I do use fooBar2000 as my music player of choice, but it doesn't do well as a sound file previewer. Editing file names is clunky, and that's an important part of archiving my WAV files.
I'm looking at XMPlay, trying to find perhaps a skin which will show sounds in a treeview, but i doubt i'd be able to drag-and-drop files from one folder to another as easily as with Explorer...

For now, in order to process all my sounds, i open my Sounds folder in Windows Explorer, make it half the width of the screen, and move it to the side. This is also the chosen Instruments folder in ModPlug's treeview, which i open without a song loaded.
I can make MPT's window thin and just show the treeview, open the sound folder and navigate thru each subfolder, pressing the C5 shortcut to play the sound at its given pitch. If i need to change the name of the sound file, i switch over to Explorer, edit the name, and slide the sound file to another folder if i need to. Then i go back to the MPT side, which has already updated the working folder (that's a good feature), and continue...
What slows me down, besides having to switch between programs, is that i can't do everything with keypresses only or mouse only. MPT doesn't automatically move its focus to the Treeview when i go back to it, and definitely not at my last sound i was previewing, and i can't devise a shortcut to do that. I'd also love to have a Rename option in the context menu of the Preview pane, and a Move to folder, which would help.
This is why i need another way to preview sounds and rename and drag-and-drop them as needed...