DecompressCore
int DecompressCore(const str_utf16 * pInputFilename, const str_utf16 * pOutputFilename, int nOutputMode, int nCompressionLevel, int * pPercentageDone, APE_PROGRESS_CALLBACK ProgressCallback, int * pKillFlag);
nRetVal = DecompressCore(pInputFilename, NULL, UNMAC_DECODER_OUTPUT_NONE, -1, pPercentageDone, ProgressCallback, pKillFlag);
return DecompressCore(pInputFilename, pOutputFilename, UNMAC_DECODER_OUTPUT_WAV, -1, pPercentageDone, ProgressCallback, pKillFlag);
return DecompressCore(pInputFilename, pOutputFilename, UNMAC_DECODER_OUTPUT_APE, nCompressionLevel, pPercentageDone, ProgressCallback, pKillFlag);