We are not able to enforce US culture
setting while generating PPT on other culture computer systems. PPT should
always be opened in US culture irrespective of local system culture settings.
Product – Microsoft office PowerPoint 2013
I have observed the requirements shared by you and like to share Aspose.Slides is workable with all standard locales. You can set the locale setting in start of application. The English US is a standard locale and is workable with Aspose.Slides. Please visit this web link for setting Locale in .NET application.