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Com 3 is a serial port, you would need to get a USB to Serial adapter. Set the properties of the adapter in Windows 10 so that it is seen as Com3. If you have another device (focuser?) that also is serial, you would need another adapter which you would set as a different Com port number as you cant use 2 devices on the same Com (serial) port.
Make sure that the USB to Serial adapter you buy has drivers suitable for Windows 10 in either 32 or 64 bit, whichever your version of Win 10 is...
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