Thanks to Avro, the numero uno Bengali input software, working with MS Word in Bangla is just child’s play. No more issues e.g. no spell-check errors, seamless transition from English mode to Bangla mode at the press of a key (F12) or a single click.
If you are using Notepad, the notepad file has to be saved in Unicode format. That’s all.
In fact, in all Windows applications which have support for Unicode you can type in Bangla.