Thanks, Angie

http://s225.photobucket.com/albums/dd271/froggy0804/

Nothing you can do about past damage such as that.

You might consider calling a certified arborist for an on-site evaluation to determine if the tree may topple or if it is stable.

Treating naked wood divides opinions but I have done it. After couple sunny days when the wood is dry brush open areas with wood treatment which has rotting preventives. They are thin like water and soak well.

Removing the bark and/or brushing the tree and/or sealing it won't do anything to help. In fact, sealers can make things worse by increasing the moisture within the wood so that rot can readily extend.

If any "animals" are present, it's likely they are insects that live in/on dead wood. They may or may not be the cause of the dead wood.

If any holes exist, with or without water, it's not important. Water-filled holes don't rot because the water inhibits the process. But if you cut/drill a pathway for the water to drain, you will assist the existing rot to extend into new wood.

Better to have a certified arborist examine the tree and its surroundings to look for the real cause.

The dead wood has been there for a long time. It may or may not be extending any further. The tree's outcome will depend upon why the wood died long ago.

On fifth picture bare wood is already grey and soon there are black spots. Sure sign of destruction. Maple wood is hard but it rots easily. I dont know the name of product but I am sure you find it at HW store. It is used on wood before painting if someone wants to build wooden houses which lasts. It is used on decks but it is not oil. It does not make a layer like paint and it penetrates in to the wood.

I am certain that holes which collect water speeds destruction because standing water is exellent atmosphere for life. Also many trees grow where water freezes. If temperature fluctuates around 32F happens the same phenomen which brokes waterhoses and brings rocks up from the earth.