If you load pptx files using PowerPoint Viewer 2007 on XP Embedded or Windows Embedded Standard 2009 you will get the following error message:
“This file requires the Compatibility Pack for the 2007 Office system to view its contents”
The reason for this error message is that PowerPoint Viewer 2007 needs the t2embed.dll located in the Windows\system32 directory.
To solve the error copy the t2embed.dll from a XP Professional system to your embedded system.