Unfortunately, you cannot open a file created with a non-US version of Money with the US Microsoft Money Sunset version. The two file types are not compatible.
If you do wish to use Money Sunset, you will have to export all of your accounts individually as CSV files and import all of them at once into a new blank Money Sunset file. You will lose information. You must ensure that the investment cash accounts are imported before the investment accounts are, and some people have posted tricks to enable that. Also be careful to import each one into the correct new account, so take extreme care in how you name the exported accounts.
I would not advise changing national versions unless you have an extremely good reason to do so.