Is this a:

• Issue with the OpenXml library
• Question on library usage

Description

Is it possible to check if a file is a valid document and not some other file type renamed to .docx or some other office extension? I know this may be off-topic here but it is becoming an increasing problem for me as people are renaming other files e.g. videos to .docx and uploading them to my servers.

Information

• .NET Target: .NET Core 3.1
• DocumentFormat.OpenXml Version: Any version