You could be in a great deal of trouble unfortunately. Version 8 is very old and has not been supported for some considerable time. This would not normally be an issue, but I do not know if there was any form of backup in this version, so if there has been a corruption and you do not have a full copy of the project elsewhere there may be no recovery options.

I suggest closing the project and restarting the PC and see if the project opens, if it does you are lucky. Irrespective, my strongest recommendation is to purchase a current version of WX5 (the go version is very cheap but may not support sufficient pages for your site https://www.incomedia.eu/en/software.php) and recreate your site using copy and paste from the online site to the project to restore content.

Unfortunately there is no automated upgrade path from V8 through to the current versions.

Hello,

If memory serves, there is on version 8 (when we created it) a BWS backup file that we need to rename to IWP and see if the project works.

In addition, to convert a project to version 8, you have to go through version 9, then a recent version (at least 12, Or version 10 with the optimizer) to obtain a usable file. But the new features of the software will require a lot of work to develop the project.
It is better, I think, to start from scratch to redo a beautiful site.

Please note, the Go version is very limited in its functionality ...

hope this can help a bit,

J.P.