You could look into Aspose
https://products.aspose.app/words/conversion
There is an online converter available and it has libraries for many different languages and filetypes
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Hello, I'm making a test program that applies AIP labels and the doc or ppt files I used to use before get an error when applying labels. Is there an SDK or library that I can switch to a format for applying labels (e.g. .pptx, .docx, .xlsx)?
You could look into Aspose
https://products.aspose.app/words/conversion
There is an online converter available and it has libraries for many different languages and filetypes