Another limitation is a maximum file size of 2GB, which can cause problems (for example) when making backups of large courses. One of the problems is that Moodle may fail to access data if there are more than 2 billion records in one database table because the id column is too big for integers. Windows is not suitable for large Moodle installations because PHP for Windows does not support 64-bit integer numbers, even if it is running on 64-bit Windows in 64-bit mode.
