Using Code Gear Delphi 2007 (don't know if it matter), each time a ".bpl" package is compiled, a ".~bpl" file is created too. What are ".~bpl" files? Are those files required or is there a way to avoid their creation?
It's the backup of the previous copy of the BPL file, just like the .~pas files are backups of the .pas files and the .~dsk file is a previous copy of your desktop settings file and the .~dfm is a previous copy of your .dfm file.
There's no way to avoid their creation, but they're harmless. I'm not sure why they would concern you, but you can always create a post-build event in your project to delete them after a successful build.