Method 1: (32bit only)
PPortJoy can create virtual joysticks in Windows, and comes with a tool called PPJoyKey which allows you to map keystrokes to the virtual joysticks axes and buttons.

Download PPortJoy
Mirrors: 1, 2, 3

To make this work with windows games which do not allow 2 players to use a single keyboard (such as Virtua Tennis and some EA games), a patch to PPortJoy must be applied, which enables the "number of axis's" option in PPortJoy. By default, PPortJoy creates virtual joysticks with 8 axes. But Virtua Tennis will not recognize joysticks with more than 4 axes. So using the patched version of PPortJoy, you can create virtual joysticks with 2 axes, and Virtua Tennis will recognize them. To apply the patch, simply copy PPortJoy.cpl over the old one in the windows system folder.

Method 2:
You can use a Playstation2-PS3/USB adapter along with our Playstation 2 adapter to connect your X-Arcade to a PC via USB. This allows you to change modes just like on the PS2 & 3 console.

Method 3:
You can make the X-Arcade act like an Xbox 360 Gamepad with this program (based on RacerS’ X360 emulator). Simply unzip it to your C:\Windows\System32 folder or directly into the folder of the game/emu you want to use it with.
Download it here