The Kobo Vox can open eBooks from Kobo by default by downloading them from its website to your Vox. However, for Amazon, and Barnes and Noble eBooks you need to go to Amazon Kindle and Barnes and Noble app store or website to download and install their Apps for Google Android for reading eBooks from their store in your Vox.
The GetJar marketplace which is Kobo Apps store also has a few eBook reading Apps for Android which let you download free eBooks, or buy eBooks from third party eBooks stores which support Google Android.
If you have a lot of eBooks saved in PDF format, you'll need to download and install a PDF reader for Google Android which you can also find on GetJar.
You can also download a PDF readers for Android at Amazon like Adobe Acrobat Reader PDF Reader for Android.
If you need to open .doc, .xls, .ppt files which are Word document, Excel spreadsheet, and Power Point Presentation files for Microsoft Office, you need to download and install a third party Office Suite App program for Android like OfficeSuite Pro 5 for Android which can Create, edit, and view MS Word and Excel documents, View PowerPoint and PDF files, and use Google Docs to access and manage files online.
You can also try using Google Docs to edit and create and view document and office files online, but you need a Gmail account, and an internet connection to use Google Doc's on your Kobo Vox's Web Browser.
The GetJar marketplace which is Kobo Apps store also has a few eBook reading Apps for Android which let you download free eBooks, or buy eBooks from third party eBooks stores which support Google Android.
If you have a lot of eBooks saved in PDF format, you'll need to download and install a PDF reader for Google Android which you can also find on GetJar.
You can also download a PDF readers for Android at Amazon like Adobe Acrobat Reader PDF Reader for Android.
If you need to open .doc, .xls, .ppt files which are Word document, Excel spreadsheet, and Power Point Presentation files for Microsoft Office, you need to download and install a third party Office Suite App program for Android like OfficeSuite Pro 5 for Android which can Create, edit, and view MS Word and Excel documents, View PowerPoint and PDF files, and use Google Docs to access and manage files online.
You can also try using Google Docs to edit and create and view document and office files online, but you need a Gmail account, and an internet connection to use Google Doc's on your Kobo Vox's Web Browser.
