Nepali12345, I have been through this situation 6 years ago. Company did shut down about 2 months after I applied I485. Luckily, I had received my EAD and was able to find similar job. My new company wrote a letter when I received RFE and all went well. It was then, I am not sure how it is now. My attorney was saying there is a grey area but it worked out fine for me. Make sure you discuss with a good attorney. Good luck..