Nevermind! There was a backup!!! On Microsoft One-Drive! I used Calvin Tham from codementors and he helped me find the back up and save Christmas. Thank you to everyone for your help! I really appreciate it!

Also is there any service I can pay for to help me out on this stuff? I'm afraid I am going to screw this up and lose the project and I am willing to pay for someone to help me on this since it means so much to my kid.

Also got a new error. Not sure why I didn't get it before. Now it says "Refused to apply inline style because it violates the following Content Security Policy directive: "default-src 'self' blob: downloads.scirra.com 'unsafe-eval'". Either the 'unsafe-inline' keyword, a hash ('sha256-2EA12+9d+s6rrc0rkdIjfmjbh6p2o0ZSXs4wbZuk/tA='), or a nonce ('nonce-...') is required to enable inline execution. Note that hashes do not apply to event handlers, style attributes and javascript: navigations unless the 'unsafe-hashes' keyword is present. Note also that 'style-src' was not explicitly set, so 'default-src' is used as a fallback."

Added screenshot below.

I don't really know how to do that. Happy to try though.

Just to confirm. No backup. Just the one file. Happy to share it with anyone that can open it or fix. Anyone that has any suggestions on who to contact or reach out to for help, please let me know. I'm at my wits' end.

I don't think we have any backups. Checking.

I did the F12 thing and got the errors "main.js:896 Error while parsing the 'sandbox' attribute: 'allow-storage-access-by-user-activation' is an invalid sandbox flag."

And then later "Sandbox iframe unavailable, skipped logging"

and then later: "Sandbox iframe unavailable, skipped logging"

And then later: "[Project] Exception opening: File format is not recognized."

I have attached some pictures of the screen to this post.

I had a project that my son was working on for months. It was all working fine and he was finished with it and then we were showing it to his mom and now it won't open and he is heartbroken on Christmast. It just says "Failed to open project. Check it is a valid Construct 3 single.file (.c3p) project." Not sure how to get this fixed. Is there someone that I can contact that can help me out. Unfortunately, we are not very tech savy so I don't know how to even go about fixing this problem. Any insights or ideas would be most welcomed.