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Couldn't read "PowerPoint Document" record

[Aspose.Slides.PptReadException] = {Aspose.Slides.PptReadException: Couldn't read "PowerPoint Document" record. ---> System.Exception: Couldn't read [Class2688 Start
Self: Class2688, Header:RecordHeader, Type:0x3E8 [const_0], Version:15, Instance:0, Length:0x0
Class2688 End
] ---> System.Exc...

This's my code:
using (FileStream fsRead = new FileStream("275869.ppt", FileMode.Open))
var aaa = Aspose.Slides.PresentationFactory.Instance.ReadPresentation(fsRead);
aaa.Save(@"D:\Transfer\PPT\PPTtoPDF.pdf", Aspose.Slides.Export.SaveFormat.Pdf);
catch (Exception ex)
{ }


I have worked with presentation file shared by you and unable to observe the issue. Can you please share which Aspose.Slides version you are using on your end. Also please share environment details so that we can investigate.

Best Regards,