HTML -тип ввода файл принять Excel
<input type="file" accept="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" />
Shadow
<input type="file" accept="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" />
<input id="fileSelect" type="file" accept=".csv, application/vnd.openxmlformats-officedocument.spreadsheetml.sheet, application/vnd.ms-excel" />
accept=".xlsx,.xls,.csv"
<input type="file" accept=".xlsx,.xls,.csv" />