I'm looking for a library that can read Microsoft Powerpoint files.
- it must support the PPTX file format
- PPT is not required
- it does not need Office installed
- hopefully it's easy to use, not like Office Interop
- it's gratis, also for commercial use
- can be used in .NET 4
- writing files would be awesome, but reading only is ok for now
Gembox.Presentation might do the job, but is far too expensive.