Ferezz, Arjit was saying that you should change your font inside of WPS. In your graphic, it is shown that your current font is Times New Roman. From that dropdown menu, you need to choose a font other than Times New Roman (which does not have Bangla characters). If you don't have Shonar Bangla installed, you can choose any other Bengali font. If needed, you may download several at: https://www.omicronlab.com/bangla-fonts.html. (Personally, I mostly use Kalpurush in WPS.) FWIW, I have no great problem using Avro in WPS... other than the occasional WPS crash when I try to edit text that has not been inserted by Avro.