would like to have capability of importing .txt, .xls, .csv files.
Sorry for super late reply. I wasn't keeping up well and so the delay.
I am happy to tell you that Stockalyze already has very good support for these (except .xls file) and also for Metastock files. You can watch this video (https://www.youtube.com/watch?v=Jx1dNsDRJl4) to know how to import ascii data into Stockalyze.
Please let me know if you need any help.
Thanks,
sacha