how to use NopEmporiumMegastore_4.3.bak

sqlserver ? mysql ? how to use NopEmporiumMegastore_4.3.bak ?

All demo databases are available only for MSSQL Server.
Here you can find instructions how to use it (for demo purposes):
https://www.nop-templates.com/how-to-install-a-nopcommerce-theme#how-to-use-theme-demo-data