I am writing to you about a problem we encountered in working with MSO PowerPoint document using the Aspose Slides for Java library (v21.10). Specifically, when we load the PP document and then save it (immediately, without any changes) to PPTX format it works fine, but when we try to save it to PPT format an ArgumentException is thrown.
We reproduce this issue on Ubuntu 18.04.6 LTS and OpenJDK 11.
I am enclosing the zip file with test code, as well as the source PP file.
In the hope that together we will quickly overcome the problem!
test files and code.zip (1.5 MB)