score:5

Accepted answer
    const {dialog} = require('electron').remote;

...

document.queryselector('#fileselect').addeventlistener('click', function (event) {
    dialog.showopendialog({
        properties: ['openfile', 'multiselections']
    }, function (files) {
        if (files !== undefined) {
            // handle files
        }            
    })
});

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