Are you already on Froyo? If not you have to use the EB16SC29_DXC.tar first. If you are already on the Stock Froyo Leak, no need to wipe. You only need to wipe data when going from one operating system to the next (Eclair to Froyo.) You already did that if you used one of DroidXcon's ODIN packages to get to Froyo. You don't open winrar, just download the EC10SC292x_DXC.tar.rar file to your computer, right click on the file after it is downloaded, and choose "extract here." Then you place the extracted EC10SC292_DXC.tar file in the PDA section of ODIN.
Before you do that though, you will need the latest cwm, and it will be easier to do it while you already have the battery out and ODIN open. Before you flash the 2.9.2 file, flash this
CWM-ALL in the PDA section of ODIN. It should only take 7 seconds. Then unplug usb, close ODIN, reopen ODIN, reconnect USB while holding volume down button, and flash the 2.9.2 file in the PDA section. Put battery back in, reboot, and you're done.