Form 100 removes the financing contingency. The form in itself is not a way out of the contract. I don't know which contract you are using so I can't say for sure, but there is probably language regarding the financing contingency that may leave you a way out. Talk to your agent and/or a real estate lawyer for further guidance.
Its a stupid form created when the last revision to the regional contract took place. Do you have an agent? He/she should be able to give you a copy, and then you'd see what the use was. No agent? Send me an email or call me. I'll forward a copy of the form to you if you need it.