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First you throw away the saw and buy a foot of 1095 for 3 bucks!
Seriously this comes up all the time and the basic answers are this.
If you want to shape a saw blade into a knife without dammaging the heat treat you can reshape the file and cut stuff with it.
If you know the exact steel used to make the saw it can be used to make knives just like you would normal steel. Aneal, shape, HT, temper, final finishing.
If you dont know the steel its best to buy a cheap known knife steel like 1080 1095 or the like.
There are other ways like making damascus out of chainsaw blades but thats more advanced at leats in the tools needed. The cheaper knife steels are very cheap and will be the least expensive part of your knife unless you start using super steels. I would just get some 1095/1080.