Today I wanted to send it to our customer, but it viewed a message: Project cannot recognize this file format. Do you want to open this file as text only? Now I don’t know what to do, I need to send it up to end of the week.
It would help the community in resolving the message if you post the file that you are trying to open.
You may easily re-create a completely new file from the severely corrupted/bloated file:
Sometimes even the best methods can't work, then see microsoft project repair tool