Video : SD Card File Viewer for Windows Phone
Most of the Windows Phone except Lumia 92X versions have SD card support, which allows you to expand your storage. Even though most of us use it for music, video files, and other media files, many users have complained to me and asked if there is a way to view files like PDF, Doc, and text files stored on their SD card.
Windows Phone does not have a file viewer, and one of the biggest drawbacks is all the files except the media files can only be accessed if they are in phone memory unless you have chosen to switch to an SD card.

File Viewer:
Kirik SD File Viewer is a great file explorer to browse your SD card on Windows Phone. Except for the default folders like Music, Pictures, etc., it lists down all the folders present in the SD card. It can also display pdf.epub, .mkv, .flv, .vob, .divx, .zip, .7z, .bz2, .rar, .tar, .gzip, .gz, .rtf, .log in that list. So if you have a viewer, e.g., Adobe for PDF, Archiver for ZIP, and YXPlayer for .flv, you can open it.
How to open Office Documents
File Types apart from this cannot be opened directly even if it is supported. As an example, you cannot open a doc file because of the restriction in the OS. For this kind of file, the app asks you to rename it and add.KIRIK extension. Next, when you launch it, it temporarily transfers it into phone memory and then renames to its original extension and launches it in Office Hub.
In the shot, profile.doc.kirik is renamed to profile.doc in phone memory and then launched in Office Hub.
Video Demo:
Here is the video demo of the full version of the app, so you know what you get before you hit the buy button.
Download:
The app has two versions. The paid version costs you 1.99$ and lets you open and view all types of files, except for the media-restricted files. The free version supports only FLV, RAR, and PDF files.
