Getting "Not a Powerpoint 2007 presentation" exception when attempting to load/open the attached PowerPoint 2007 file using Aspose.Slides 4.4.8 with following ...
Using blobStream As New IO.MemoryStream(fileData)
Dim pptDoc As New Aspose.Slides.Pptx.PresentationEx(blobStream)
I have worked with the presentation file shared by you and have been able to observe the issue shared. An issue with ID 24308 has been created in our issue tracking system to further investigate and resolve the issue. This thread has also been linked with the issue so that you may be automatically notified once the issue is resolved. Morever, I opened the shared presentation in PowerPoint and re-saved that, I was then able to access the presentation successfully. Can you please share some details about the presentation that how and by which PowerPoint version it has been generated.
I like to share that our development team has scheduled the shared issue for mid of April. I will share further information with you as soon as they are shared.