Have you created a Web App using Web AppBuilder but find you cannot use the Export to CSV option? This article will show you the Registry setting that Internet Explorer needs in order to use this option.
In order to Export to CSV from a Web App, Internet Explorer needs to recognise that a .CSV file is a text based format. It does this using the Registry entry shown below.
Using the Registry Editor expand HKEY_CLASSES_ROOT, scroll down to .CSV and click on it, an entry called PerceivedType must be set to text.
If this Registry entry is absent then you will need to add a new string value called PerceivedType and modify its value data to text. Note, before editing the Registry you should make a backup of the registry files.