Thanks for providing us template files.
After an initial test, I observed the issue as you mentioned using the following sample code with your all three files. I found MS Excel prompts an error message “We found a problem with some content in … Do you want us to try to recover as much as we can…” when opening the re-saved file into it. The issue might be due to unsupported chart(s)/object(s) of MS Excel 2016.
LoadOptions lo = new LoadOptions(LoadFormat.Auto);
lo.MemorySetting = MemorySetting.MemoryPreference;
lo.LoadFilter = new LoadFilter(LoadDataFilterOptions.All);
Workbook workbook = new Aspose.Cells.Workbook("e:\\test2\\MapChart.xlsx", lo);
//Workbook workbook = new Aspose.Cells.Workbook("e:\\test2\\3DModel.xlsx", lo);
//Workbook workbook = new Aspose.Cells.Workbook("e:\\test2\\Icon.xlsx", lo);
OoxmlSaveOptions saveOptions = new OoxmlSaveOptions(SaveFormat.Auto);
I have logged a ticket with an id “CELLSNET-45846” for your issue. We will look into it soon.
Once we have an update on it, we will let you know here.