Traveller

I assume you don't have any backups or earlier versions saved for crosschecking purposes, so the next thing I would do is to check any and all CS sets you may have installed either immediately before or after the last save date, and temporarily remove those CS sets - and if those removed sets are not extensively used in your park .dat -file I would try to clean up the dat file again. One other problem with crashing park files I have encountered has been in situations where the park has included coasters with custom CTR or CFR. It's worth mentioning that the weird way how RCT3 saves custom made parks and scenarios can also cause issues, because RCT3 includes reference data for ALL installed CS in your .dat file, regardless if it is used in the park or not! The main thing is, that you shouldn't give up trying everything you could possibly think of! My own experience with these crashing issues is that 9 out of 10 I have been able to restore functionality, as long as the actual file is not corrupted because of Windows or HDD issues. (BTW. Fragmented NTFS file blocks can sometimes cause crashing, and I have solved occasionally these issues by simply doing a thorough defragmentation.) So, odds are still in your favor, until you have really exhausted any and all possible solve attempts. I'd love to help anyway I can, because I know exactly how frustrating and infuriating these things can be. So, if there's anything I could do for you, just ask! 🤓 The main thing is not to lose hope and optimism just yet. It's still too early for that! 😎

Oh dear, that is bad news!😱 The same thing happened to me last week, and after exhaustive troubleshooting, cleaning up the .dat file, backtracking recently installed CS sets, etc. I was able to finally solve the problem by installing a missing CS set, which had only one component of it used in the park file, but after re-installing it was no longer crashing, which is truly strange, because I had already cleaned up the .dat file, and it was no longer appearing in the "List of Required CS" in ParkCleanup 2.1. - Have you tried checking for missing and required CS with ParkCleanup?