Firstly Capita software using .NET FRAMEWORK
WHICH IS MICROSOFT
Except there will be issues using open source software with it.
It's not Capita, it's Microsoft.
Next, to solve this problem.
GET MICROSOFT WORD VIEWER and MICROSOFT EXCEL VIEWER
They are FREE to download from Microsoft Downloads ONLINE
you can even get a CD
This makes the reports run. I have tested it.
Install OpenOffice over the top, job done.