I use default.aspx page as a main page for my ExtJS application, i.e. I have this app.json config:
   * The relative path to the application's markup file (html, jsp, asp, etc.).
"indexHtmlPath": "Default.aspx",
But when I run Sencha Cmd v6.7.0.63 command "Sencha.exe app build" it generates index.html page in build\production directory with some aspx markup copied from my Default.aspx file. Shouldn't Sencha Cmd generate Default.aspx page as it is configured in the app.json file?

Another problem is that generated index.html file is saved in ANSI encoding but my Default.aspx page is in UTF-8 encoding. So, when I open this page in a browser all non-english words are non-readable.