.opf file extension on Kindle

[Integer]

I've been sent some books to read on kindle, which are in .opf file. I've copied them onto the Kindle but I can't see thme on there when I turn it on. Google has not been helpful.

Does anyone know if/how I can read a .opf file on Kindle please?!

Really don't know, but hopefully this will bump for you .

You might have to convert it to MOBI format. You can download a converter and it's simple to do. I can post link for converter if you want. Currently on pita iPod so have to get to pc