Short answer: Probably not. The Fn key is generally found on laptops and other small-form factor keyboards. In most It is not sent to or processed by the OS, but rather internally to the keyboard to get functions there just aren't enough physical keys for. Similar questions have been asked across the Stack Exchange network, and none of the other answers were hopeful either: from indicates that some laptops (Lenovos are specifically mentioned) have a BIOS option to completely change the Fn key functionality. I've personally used machines that let you swap the behavior of Fn from 'Press with the other key to get the regular function, get the special function without it' to 'Press with the other key to get the special function, get the regular function with it'. This one is Logitech-specific, so your question isn't quite a duplicate.
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Unless you have a Logitech keyboard, anyway. If you can provide a model number to your specific keyboard, we could more adequately answer your question. The Fn key on laptops is usually not accessible by the operating system (it is processed by the BIOS to enable modifiers) but on most Logitech keyboards it is customizable. See if the Logitech Gaming Software is available for your keyboard first, for full compatibility. Setpoint is a Logitech program available for older peripherals.
Otherwise, there are a plethora of keyboard button remapping softwares available (e.g. Key Remapper, KeyExtender, Remap, a Google search will turn up numerous results.).
KeyExtender can change any key on the keyboard into other keys or disable keys you dislike. But KeyExtender is not just a tool that alow you to customize your keyboard layout.With it, you can change your common 102 keyboard into a multifunctional one without costing much money.Want the Table key to press Ctrl+V?Want the F6 key to type frequently used text such as email address?Want the F9 key to display of volume when you play games?Want to lock the keyboard?Want to remap your keyboard layout without memory used? KeyExtender can do these easily,it could help you make good use of each key on the keyboard.