Provided file formats should be open (non-proprietary), machine-readable and machine-actionable to make study documents findable and interoperable. Formats like .xml, .txt, .csv, .json, PDF(A) or .rdf are preferred.
We also accept non-machine-readable formats like common PDF and proprietary formats like .xlsx or .docx. However, this will reduce the findability, interoperability and reusability of your study documents.