Jan Källman

This is implemented in EPPlus 7

This is now handled in EPPlus 7 for Conditional Formatting and Data Validation

This is fixed in later versions of EPPlus

Implemented in EPPlus 7

Add an error message if trying to open a OOXML Strict document.

Same as [#672](https://github.com/EPPlusSoftware/EPPlus/issues/672)

As we cannot do this accurately, we will not implement this feature. I suggest you request Libre Office to support auto fit rows on load.

Closing due to inactivity

Save will overwrite the existing package. This is by design. Use the SaveAs method or make a copy of the workbook before opening the package, if there are concerns about...

@curtis1757 Keeping the file will add extra cost to the save operation, doubling the amount of disk space used to save a package and add extra IO operations as well....