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public static extern long StrFormatByteSize (

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public static extern long StrFormatByteSize( long fileSize, System.Text.StringBuilder buffer, int bufferSize );

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Private Shared Function StrFormatByteSize

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public static string StrFormatByteSize (long filesize) {

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     StrFormatByteSize( filesize, sb, sb.Capacity );

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     StrFormatByteSize( size, sb, sb.Capacity )

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     public static extern long StrFormatByteSize( long fileSize, System.Text.StringBuilder buffer, int bufferSize );

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$nativeMethods::StrFormatByteSize( 1024, $sb, $sb.Capacity ) | Out-Null

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Documentation

[StrFormatByteSize] on MSDN