diff -r 675254f6311c src/newgrf.cpp
--- a/src/newgrf.cpp	Thu Dec 17 23:26:25 2009 +0000
+++ b/src/newgrf.cpp	Fri Dec 18 18:55:00 2009 +0100
@@ -251,6 +251,10 @@
 	gf->spritegroups_count = 0;
 }
 
+static bool IsBaseGRF(uint32 grfid)
+{
+	return (grfid & BSWAP32(0xFF000000)) == BSWAP32(0xFF000000);
+}
 
 typedef std::map<StringID *, uint32> StringIDToGRFIDMapping;
 static StringIDToGRFIDMapping _string_to_grf_mapping;
@@ -3620,8 +3624,8 @@
 	uint16 num = grf_load_extended(&buf);
 	uint16 offset = HasBit(type, 7) ? grf_load_extended(&buf) : 0;
 	ClrBit(type, 7); // Clear the high bit as that only indicates whether there is an offset.
-
-	if ((type == 0x0D) && (num == 10) && _cur_grffile->is_ottdfile) {
+	
+	if ((type == 0x0D) && (num == 10) && IsBaseGRF(_cur_grffile->grfid)) {
 		/* Special not-TTDP-compatible case used in openttd(d/w).grf
 		 * Missing shore sprites and initialisation of SPR_SHORE_BASE */
 		grfmsg(2, "GraphicsNew: Loading 10 missing shore sprites from openttd(d/w).grf.");