Using Write Range with an empty Range property in an existing Excel file will:

When using the Write Range activity in UiPath with an empty Range property in an existing Excel file, the behavior of the activity is to overwrite the existing data in the specified worksheet. This means that any data that is already present in the worksheet will be replaced by the new data being written.

An empty Range indicates that the operation should start from the first available cell in the sheet, which typically is "A1". Hence, if you write new data without specifying a starting cell, it will fill in from the top-left corner of the worksheet. As a result, all existing content in the designated range will be cleared and replaced with the new values provided in the Write Range activity.

This contrasts with other potential outcomes like appending data, which would require specifying a range that does not interfere with existing data, or creating a new worksheet, which would involve different operations entirely. Thus, the choice to overwrite aligns with typical functionality of writing data in Excel through automation scenarios in RPA, making it the correct response.