The tool you're likely referring to is Sidder, a utility used by IT administrators to map User Profile Disks (VHDX files) to their corresponding domain users. While you mentioned "Sidder 26 2021," the most recent official version from the developer is Sidder v2.6. How to Download Sidder v2.6
"sidder 26" filetype:exe OR filetype:msi OR filetype:zip
intitle:"sidder" "2021" software download
File Management: Includes a built-in delete button to remove old or orphaned .vhdx files directly from the interface. download sidder 26 2021
Usage Indicators: Features a status indicator (often a red drive icon) to show if a profile disk is currently "in use" or locked by a session. The tool you're likely referring to is Sidder
Which of those would you like?
VHDX Management: Includes capabilities to see file sizes and last modified dates. File Management : Includes a built-in delete button
Let me know how you'd like to proceed with your RDS management. MarkusDick/SidderPlus - GitHub