In much the same way that humans rely on the environment for air, water, food and shelter – Nvivo relies on its software environment (otherwise known as Microsoft Windows) for support. Now to make your Windows computer run faster, Microsoft has chosen to include as part of its software environment only those software resources that are commonly needed. When it comes to audio and video most people using Windows get by with the Codecs that Microsoft has included and even more people never even need consider the word Codec.
But successfully importing even familiar video formats such as .AVI and .MOV into Nvivo is hit and miss unless you take the time to install an extra Codec pack such as the Media Player Codec Pack. It is not enough to rely on the list of supported formats that QSR advertise for Nvivo. As QSR themselves clarify on the Nvivo 10 Help website: “If the required codec is not installed on your computer, you will not be able to import or play the file, even if it is in a supported format.” 
- Microsoft. The default codecs that are included with Windows Media Player 9 and with Windows Media Player 10 Retrieved 31 January, 2013, from http://support.microsoft.com/kb/899113
- Wikipedia. (2013). Codec Retrieved 31 January, 2013, from http://en.wikipedia.org/wiki/Code
- cnet download.com. (2013). Media Player Codec Pack Retrieved 31 January, 2013, from http://download.cnet.com/Media-Player-Codec-Pack/3000-13632_4-10749065.html?tag=mncol;2
- QSR International. Media file formats supported by NVivo 10 Retrieved 31 January, 2013, from http://help-nv10-en.qsrinternational.com/nv10_help.htm