How can we convert .ppt files having modify password to .pptx/.pptm extensions?
I have observed your comments and like to share that without password, you will not be able to open up the presentation on your end using Aspose.Slides. So, the password will always be known otherwise you will not be able to load the presentation. Secondly, you can retain or remove protection\password for new presentation before saving. Please refer to documentation links shared by me in previous post as it answers your quires.