Win 7 / Linux Guest - Cannot delete backup file on shared folder.

[agilis]

When a backup~ file is created in a directory within a VirtualBox's shared folder, the program that created the backup~ file cannot remove the file preventing the original file from being saved. Trying to remove the backup~ file manually via 'rm' results in an 'Operation not permitted.' message. The only way to remove the backup~ file is navigating to the directory from the Host system and removing the file that way.