Yes, as long as your computer uses Windows-1252 (Western European) alphabet. If not, you have to use Unicode textfiles.
You can convert your default encoded text document by opening it with a text editor such as Wordpad, and then save it as a Unicode text document.
You can use Excel to import the textfile as text data. Excel allows you to select the encoding from a long list.
Probably your data couldn't be parsed, you may check it and try again. Check the data carefully if you didn't ellaborate it by yourself.
For now the website and the service run on different computers, and the delay is a few days. Even if there was an error and the process couldn't be completed, the process should eventually be listed anyway, if as an error instead of as a result file.
If there's an error and the process can't be completed, it will eventually be listed as finished anyway, but an error message will show instead of the preview map, in the map frame.