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The page for PowerShell's Get-ChildItem cmdlet is here.
That page explains the "-Filter" parameter as "A filter in the provider's format or language." It might be helpful to add a few points:
According to Lee Holmes :
* "The value of this parameter qualifies the Path parameter."
* "In the Filesystem Provider’s case, the Win32 API (FindFirstFile) takes a pattern parameter that is then processed by the API itself. When you use wildcards in cmd.exe, file resolution and wildcarding is done directly by this Win32 API."
Or, as a StackOverflow answer puts it:
* "The Filter of FileSystem provider rather uses CMD wildcards than PowerShell wildcards."
The StackOverflow answer also has a link to some interesting stuff about how CMD wildcards got to be what they are.
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