Android/Samsung mobile phone won't open pdf or word files?
Android mobile phones will try to use a default app to open a PDF or Word file, but sometimes you might not have the software installed on your mobile phone.
To open Word Documents we recommend you download Microsoft Word: https://play.google.com/store/apps/details?id=com.microsoft.office.word
To open PDF Document we recommend Adobe Reader: https://play.google.com/store/apps/details?id=com.adobe.reader