The following snippet creates a directory and shares that directory:

$path = 'C:TempWmiPermissions' 
New-Item $path -ItemType Directory

$params = @{
    ClassName = 'Win32_Share'
    MethodName = 'Create'
    Arguments = @{
        Name = 'WmiPerms'
        Path = $path
        Type = [UInt32]0
    }
}
Invoke-CimMethod @params 

The Create method used here will fail if the argument for Type is not correctly defined as a UInt32 value. PowerShell will otherwise use Int32 for a value of 0.

The requirement for UInt32, in this case, may be viewed by exploring the parameters required for the method:

PS> (Get-CimClass Win32_Share).CimClassMethods['Create'].Parameters | Where-Object Name -eq Type

Name CimType Qualifiers ReferenceClassName
---- ------- ---------- ------------------
Type UInt32 {ID, In, MappingStrings}