Sony typically distributes drivers bundled within their companion software or as a standalone package often labeled "Sony Mobile Drivers" or identified by the hardware ID. For most modern Xperia phones, the driver is usually included in the Sony Xperia Companion software. However, for users who do not want to install the full Companion suite just to transfer files, standalone drivers are available.
Pull down notification shade on your Xperia, tap “USB for charging,” and change to “Transfer files” or “MTP.” sony xperia usb drivers for windows 10 64 bit