This is your bios DISK_1.IDX. It cannot be opened by any tools that are available....even Yen and 911medic who are experts on bios tell me that this cannot be modified....this was the beginning of what has become INSYDE Bios.....which is a form of Phoenix but nothing like a regular Phoenix bios.
You cannot put a slic in it unless there is an existing slic....it is impossible to do so with a Dell Phoenix Bios.