For those who decided to stay with Office 2003 and not upgrade to Office 2007,but often found with the problems like unable to open other files like docx, pptx, xlsx or similar to that Office, since they are from the 2007 version.
For these users, Microsoft has a patch that can activate the compatibility with Office 2007 in Office System 2003, allowing “transform” literally from one version to another. The conversion involves no apparent loss of the features that you might bring a later version, but some features may be disabled during the conversion or after this.
The operation is very easy, because all we have to do is install the software and then click on the files to begin its transformation to the new format. Once this happened, you can work easily with Office 2007 files in Office 2003
Download Link : Compatibility with Office 2007