Can a external wireless lan be a substitute for ethernet?

[Nisia]

You want to make your blueray wireless....

...hmmm.

1. If your BR already has a wifi card built in, you just need to connect it to your router so you can have an internet connection

2. If your BR is not wifi ready (which usually means that you need to purchase an USB adapter that is specifically compatible with your BR) there's reason for the blue-ray to be wired and that is because with the wired connection it will deliver better and faster service from those apps you want to use.

I've just googled "rj45 wifi" and to my surprise there seems to be a Wifi adapter that has a an RJ45 (that's the network connector of a standard network cable) for about $10. It says that it works with lots of stuff, but I will leave it to you to research. I would not recommend wifi for such stuff as it is slower and crappier. You may not be able to get HD quality out of those netflix movies.

Good luck!