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GetFileSize

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	Name	Description
int64	GetFileSize ( const FString& Filename )	Returns the size of a particular file in the build
int64	GetFileSize ( const TArray< FString >& Filenames )	Returns the total size of all files in the array
int64	GetFileSize ( const TSet< FString >& Filenames )	Returns the total size of all files in the set

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