It's still recoverable after a complete delete because when you delete a file, all that happens is the area on the disk in which is was stored is marked as free - the data is still there, so if you get a decent undelete tool, it might be possible to restore the file pointers and get the file back as it were. Only problem is that once deleted, the area of the disk it used to be on becomes free reign for anything else to write it's own file to if it needs to, and if that happens, then you won't be able to recover the complete file again. Recovering parts of it would require advanced tools.

I prefer having the Recycle Bin disabled on my PC, so pressing delete trashes anything immediately for me (with confirmation of course)