When I try to convert this sample excel file that contain dde frm xlsx to xls it will have protected view prompt. It only occurs for this conversion, regardless if I want dde to be kept or removed in output xls.
Disclaimer: The dde in this sample file contains just a command to run calc.exe. (it is a not malicious file) but it will prompt an dialog asking to update or not, just click don’t update.
Here are the sample file and the code that I’ve tried.
sample_with_dde.zip (16.4 KB)