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diff --git a/src/parsec/sys_conv.cpp b/src/parsec/sys_conv.cpp
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+/*
+ * PARSEC - Package Data Conversion
+ *
+ * $Author: uberlinuxguy $ - $Date: 2004/09/26 03:43:41 $
+ *
+ * Orginally written by:
+ *   Copyright (c) Markus Hadwiger     <msh@parsec.org>   2000
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */ 
+
+// C library
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// compilation flags/debug support
+#include "config.h"
+#include "debug.h"
+
+// general definitions
+#include "general.h"
+#include "gd_heads.h"
+#include "objstruc.h"
+
+// global externals
+#include "globals.h"
+
+// local module header
+#include "sys_conv.h"
+
+// proprietary module headers
+#include "sys_swap.h"
+
+
+
+// convert all mp3 files contained in a package to wavs (in-place) ------------
+//
+PRIVATE
+int ConvertPackageMP3sToWAVs( const char *packname, size_t baseofs, int numitems, pfileinfodisk_s *items )
+{
+#ifdef HAVE_MP3
+
+	ASSERT( packname != NULL );
+	ASSERT( numitems >= 0 );
+	ASSERT( items != NULL );
+
+	int numconverted = 0;
+
+	// determine file size for append position
+	FILE *fp = fopen( packname, "rb" );
+	if ( fp == NULL ) {
+		return -1;
+	}
+	if ( fseek( fp, 0, SEEK_END ) != 0 ) {
+		fclose( fp );
+		return -1;
+	}
+
+	dword appendpos = ftell( fp );
+
+	fclose( fp );
+	fp = NULL;
+
+	// scan entire file list for mp3 files
+	for ( int curit = 0; curit < numitems; curit++ ) {
+
+		// check mp3 extension
+		int len = strlen( items[ curit ].file );
+		if ( len < 5 ) {
+			continue;
+		}
+		if ( stricmp( &items[ curit ].file[ len - 4 ], ".mp3" ) != 0 ) {
+			continue;
+		}
+
+		// display stand-by message
+		if ( numconverted == 0 ) {
+			MSGOUT( "You have started Parsec for the first time.\n" );
+			MSGPUT( "Please wait while converting data..." );
+		} else if ( ( numconverted & 0x03 ) == 0 ) {
+			MSGPUT( "." );
+		}
+
+		// open pack for mp3 reading
+		fp = fopen( packname, "rb" );
+		if ( fp == NULL ) {
+			return -1;
+		}
+
+		// set read position
+		size_t readpos = baseofs + items[ curit ].foffset;
+		if ( fseek( fp, readpos, SEEK_SET ) != 0 ) {
+			fclose( fp );
+			return -1;
+		}
+
+		// autocrop by default
+		dword cropstart = 0;
+		dword cropend   = 0;
+
+		// hardcoded crop positions for looping samples
+		if ( stricmp( items[ curit ].file, "back4-r.mp3" ) == 0 ) {
+			cropstart = 1382;
+			cropend   = 690825;
+		} else if ( stricmp( items[ curit ].file, "blitz2-r.mp3" ) == 0 ) {
+			cropstart = 1304;
+			cropend   = 79687;
+		} else if ( stricmp( items[ curit ].file, "thrus2-r.mp3" ) == 0 ) {
+			cropstart = 1351;
+			cropend   = 24062;
+		} else if ( stricmp( items[ curit ].file, "helix2-r.mp3" ) == 0 ) {
+			cropstart = 1387;
+			cropend   = 3050;
+		}
+
+		// conversion will return size
+		size_t wavdatasize;
+
+		// convert mp3 data to wav
+		char *memwav = SND_ConvertFileMP3ToMemWAV(
+			fp, items[ curit ].flength, &wavdatasize, cropstart, cropend );
+		if ( memwav == NULL ) {
+			fclose( fp );
+			return -1;
+		}
+
+		// done with mp3 reading
+		if ( fclose( fp ) != 0 ) {
+			FREEMEM( memwav );
+			return -1;
+		}
+
+		// open pack for appending
+		FILE *fp = fopen( packname, "ab" );
+		if ( fp == NULL ) {
+			FREEMEM( memwav );
+			return -1;
+		}
+
+		// append wav data to pack
+		size_t byteswritten = fwrite( memwav, 1, wavdatasize, fp );
+		if ( byteswritten != wavdatasize ) {
+			FREEMEM( memwav );
+			fclose( fp );
+			return -1;
+		}
+
+		// free mem allocated by SND_ConvertFileMP3ToMemWAV()
+		FREEMEM( memwav );
+		memwav = NULL;
+
+		// done with appending wav data
+		if ( fclose( fp ) != 0 ) {
+			return -1;
+		}
+
+		// patch file info list
+		items[ curit ].foffset = appendpos;
+		items[ curit ].flength = wavdatasize;
+
+		strcpy( &items[ curit ].file[ len - 4 ], ".wav" );
+
+		appendpos += wavdatasize;
+		numconverted++;
+	}
+
+	if ( numconverted > 0 ) {
+		MSGOUT( "\n" );
+	}
+
+	return numconverted;
+
+#else // !HAVE_MP3
+	
+	return 0;
+
+#endif 
+}
+
+
+// convert all mp3 files contained in a package to wavs (in-place) ------------
+//
+int SYS_ConvertPackageMP3s( const char *packname, size_t baseofs )
+{
+	ASSERT( packname != NULL );
+
+	// open package for reading at specified offset
+	FILE *fp = fopen( packname, "rb" );
+	if ( fp == NULL ) {
+		return FALSE;
+	}
+	if ( fseek( fp, baseofs, SEEK_SET ) != 0 ) {
+		fclose( fp );
+		return FALSE;
+	}
+
+	packageheader_s packheader;
+
+	// read fixed-size part of header
+	size_t bytesread = fread( &packheader, 1, sizeof( packheader ), fp );
+	if ( bytesread != sizeof( packheader ) ) {
+		fclose( fp );
+		return FALSE;
+	}
+
+	// file format validation
+	if ( stricmp( packheader.signature, "msh DataPackage" ) != 0 ) {
+		fclose( fp );
+		return FALSE;
+	}
+
+	// swap endianness of fixed-size part of header
+	SYS_SwapPackageHeader( &packheader );
+
+	// fetch size of remaining header and number of contained items
+	size_t headersize = packheader.headersize;
+	dword numitems   = packheader.numitems;
+
+	// read file list
+	pfileinfodisk_s *items = (pfileinfodisk_s *) ALLOCMEM( headersize );
+	if ( items == NULL ) {
+		fclose( fp );
+		return FALSE;
+	}
+	if ( fread( items, 1, headersize, fp ) != headersize ) {
+		FREEMEM( items );
+		fclose( fp );
+		return FALSE;
+	}
+
+	// will be reopened later on
+	fclose( fp );
+	fp = NULL;
+
+	// swap endianness of file info list
+	dword curit = 0;
+	for ( curit = 0; curit < numitems; curit++ ) {
+		SYS_SwapPFileInfo( &items[ curit ] );
+	}
+
+	// convert all contained mp3s to wavs
+	int numconverted = ConvertPackageMP3sToWAVs( packname, baseofs, numitems, items );
+	if ( numconverted == -1 ) {
+		FREEMEM( items );
+		return FALSE;
+	}
+
+	// avoid patching if nothing changed
+	if ( numconverted < 1 ) {
+		FREEMEM( items );
+		return TRUE;
+	}
+
+	// open package for writing the patched header
+	fp = fopen( packname, "rb+" );
+	if ( fp == NULL ) {
+		FREEMEM( items );
+		return FALSE;
+	}
+	if ( fseek( fp, baseofs + sizeof( packheader ), SEEK_SET ) != 0 ) {
+		FREEMEM( items );
+		fclose( fp );
+		return FALSE;
+	}
+
+	// swap endianness of file info list
+	for ( curit = 0; curit < numitems; curit++ ) {
+		SYS_SwapPFileInfo( &items[ curit ] );
+	}
+
+	// write patched header
+	if ( fwrite( items, 1, headersize, fp ) != headersize ) {
+		FREEMEM( items );
+		fclose( fp );
+		return FALSE;
+	}
+
+	FREEMEM( items );
+
+	if ( fclose( fp ) != 0 ) {
+		return FALSE;
+	}
+
+	return TRUE;
+}
+