>>>I have accidentally increased the size of desktop icons on a remote Swedish Window 8 machine
>>>
>>>How can I make them smaller again
>>
>>Are you sure that you haven't simply turned the magnifier on? Windows button and + or - will fix that. If not, send me a private email with what you see when you right-click on the desktop.
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>
>Thanks a lot

Click on the desktop and hold the CTRL key and roll the mouse Wheel in either direction.