Many of the new beta Microsoft Teams APIs, such as this require the caller to specify the unique ID of the group. Does anyone know how to find a given group's ID?
For older *.doc documents this was enough:
header("Content-Type: application/msword");
What mime type should I use for new docx documents? Also for pptx and xlsx documents?
Is there a free or open source library to read Excel files (.xls) directly from a C# program?
It does not need to be too fancy, just to select a worksheet and read the data as strings. So far, I've …