Below powershell code helps you to list the files which are greater than given size(2GB in this case) and output the file sizes in MB/GB format. This command searches for files inside c:\mydata folder. You can run this against any folder.
Get-ChildItem -path c:\mydata -recurse | Where-Object { ($_.Length /1GB) -gt 2 } | ForEach-Object { ($_.length/1GB).Tostring("0.00") }
Happy Learning,
Sitaram Pamarthi