Is there a way to add Kindle Fire as a device on the Android Market Possible Duplicate:
  How can I download an APK file from the Android Market?  




I want to download APKs from the Android Market and sideload them to my Kindle Fire. I'm able to run APKs using ES File Explorer but not able to download them :(
The title of your question and it's body are really not very related to one another, but I think the title is actually something that's worth covering since I haven't really seen it come up here before (in a general sense).

Per the title of your question: You can't register a device on the Market from the web interface alone. Devices appear once the Market application has been configured on the device itself, at which point you can install applications via the web interface or from the device directly. The Market's website basically uses C2DM ("push") to install the app to the device over the air, it does not download the .apk to your computer.

So, per the body of your question: You cannot download .apk files from the Market website to sideload them - even with a registered device - so ES File Explorer is not going to help you with that. This has also been previously asked here: How can I download an APK file from the Play Store?

Your Kindle Fire will appear in your account (it most certainly does on mine, anyway) if you install the Market on it and log into your account from the device. There is a question regarding how to do this already: How can I get the Android Market installed on my Kindle Fire? Note that you must be rooted to do this.