Do not think that you can only do this with the Business Connector.
The response that you return from the GetItem request using the "writeBinaryToDisk" attribute should contain the path to where the media file was recorded - usually in the Windows "Temp" folder, but you can configure it by adding "binaryPath". Search for:
<tcmapi:MultimediaFilename>C:\WINNT\Temp\rad5FB9C.tmp</tcmapi:MultimediaFilename>
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, - , , "images". Tridion !