One of my numerous CorelDraw files in trouble. Several days ago, I was working on huge project in CorelDraw X7 and my laptop stopped responding and shut down. I turned it on and application viewed me not bad message: Error reading a CorelDraw file. I have lack of ideas what to undertake.
I had the same issue. I tried many various solutions. But it looks like your .dwg is corrupted. I visited corelforum, and typed there repair coreldraw. I found an answer with variable solutions, see it below...https://support.corel.com/hc/en-us/articles/216435167-How-To-Recover-Corrupted-CDR-Fileshttps://onlinefile.repair/en/coreldraw.htmlhttps://www.repairtoolbox.com/coreldrawrepair.html
The "online repair" websites are almost useless.
One of the most common situations is an error while the file was compressing, then the solution is to copy the file, change the file extension CDR for .ZIP and open the file with Corel Winzip, then extract the CDR inside. And also, you should have the backup of the file (the last saved version) and the autobackup file.
Since you mention it was a huge project, maybe the reason was inside Windows: check the amount of the Virtual Memory of your computer, and increase it (as big as possible). Virtual memory (the swap file) is used by Windows to storage temporary files. Imagine your'e working with a 200 mb file and you have only 20 temp files, that could be 200x20=4000 Mb So, if your Virtual Memory is set to 4000 Mb, your computer will crash after reach this amount, And also, if you set Windows to "auto adjust virtual memory", when size is not enough, Windows will increase it, but while Windows is increasing the swap file, all other programs will freeze, including CorelDRAW.