I Installed Midnight Commander to edit the xml, worked fine.

Back to the other topic:
I received the message from my PC (where I have my landline number as whatsapp account), but so far have been unable to reach anyone. The only person I could get a hold of to try this out didn't seem to have the option to write to me in her phone whatsapp. will try more tomorrow.

Some things I noticed:
Yes, when you close the app, you will still receive messages, BUT if you interrupt your internet connection and reconnect, this no longer works. Also, if I send something PC ->phone while phone is offline, then go online and start whatsapp, I will receive a window telling me that my PC is writing to me, but the messages I sent while the phone was offline are lost.
Just FYI.