This is easy but different than using find e.g.:
Get-ChildItem -File | Foreach {c:\user\local\bin\myprog $_.fullname}
For doing stuff at the command line, aliases can make this a bit more terse:
ls -file | % {c:\user\local\bin\myprog $_.fullname}
PowerShell prefers commands that are narrow in focus but that can be composed together in a pipeline to provide lots of capability. Also, PowerShell pipes .NET objects e.g. Get-ChildItem pipes System.IO.FileInfo objects. You can then use commands like Foreach, Where, Select, Sort, Group, Format to manipulate the objects passed down the pipeline. If you have time, I recommend you checking out my free ebook Effective PowerShell.