Impress changed to PowerPoint

[Mrm2]

So currently in one class of university we had to use open office to create a Slide show useing Impress.
I did mine in ingress and submitted it.But the thing is, when the lecture tried to mark it it showed up on Powerpoint and i got 0.It should be noted the computer i worked on did not have any form of PowerPoint on it.And yes the pc she marked from has both PowerPoint and Impress.Any possible ideas what might have happend?

[RoryOF]

In which format did you Save the file? .odt or .ppt?