Well there are several ways. You can drop it in your sync folder on your desktop, or if your computer has a card reader like mine you can take the card out of your AX and put it in your PC and transfer it using windows explorer, our you can use windows explorer when your AX is connected to your PC to drag and drop the file onto your card. Good luck.
OK try this.
Once you have sync'd with your PC open WMDC and click on "Moblie Device Settings"
Then click on "Change Content Sync Settings"
At the bottom you should have "Files" selected in the tick box, if you don't then do that.
Next click "Sync Settings" under the "Files" heading.
Ok once you've got there, it will let you add any file on you computer to sync.
Hope this helps.
My Axim has about 80 MB memory. The XD card adds about 1 GB memory. How can I move a large file, 137 MB, from my PC to the XD card?
The way I do this is through a card reader. I have a 6 in 1 card reader. Its alot faster than using any syncing capacity the X51V has in eithor XP or Vista IMHO.