Install SyncToy

SyncToy is a nice backup tool from Microsoft that is sadly not supported or even offered for download anymore.
The best download opportunity IMO is from archive.org (https://web.archive.org/web/20190427065841/http://download.microsoft.com/download/6/c/4/6c406239-a648-4e01-833e-2c452deed3b6/SyncToySetupPackage_v21_x64.exe) since this should be a snapshot from the original Microsoft site.

To be able to install SyncToy, the installer asks for a specific .NET version. This version is included in the .NET Framework that can be installed in Windows by

• hitting the Windows Key and typing „Turn Windows features on or off.
• selecting „.NET Framework 3.5 (includes .NET2.0 and 3.0)

Install SyncToy afterwards.

Prepend a number to all files names in a directory

ls | Rename-Item -NewName {"1" + $_.name}

• ls lists all files names in the current directory
• | forwards the names to the Rename-Item command
• -NewName renames the item to the name shown in the brackets
• $_.name refers to the old name forwarded
• „1“ + $_.name prepends 1 to the old name

Remove the first three characters of all files in a folder with rename command from command line

rename "???*.*" "///*.*"