To get the most out of spreadsheets like IDS-1.xls, it's essential to follow best practices, including:
What is an .XLS file and how to open, view and edit one - Adobe
.xls is older (Excel 97–2003). To upgrade:
Be cautious if downloading this file from unfamiliar sources (like Scribd or Google Drive ), as files with this naming convention are frequently associated with accidental data leaks or automated "Untitled Folder" uploads.