diff --git a/premake5.lua b/premake5.lua
index 9deeb3d..940ee1c 100755
--- a/premake5.lua
+++ b/premake5.lua
@@ -223,6 +223,19 @@ project "lights"
 	removeplatforms { "*null" }
 	removeplatforms { "ps2" }
 
+project "ska2anm"
+	kind "ConsoleApp"
+	characterset ("MBCS")
+	targetdir (Bindir)
+	files { path.join("tools/ska2anm", "*.cpp"),
+	        path.join("tools/ska2anm", "*.h") }
+	debugdir ( path.join("tools/ska2nm") )
+	includedirs { "." }
+	libdirs { Libdir }
+	links { "librw" }
+	findlibs()
+	removeplatforms { "*gl3", "*d3d9", "*ps2" }
+
 project "ps2test"
 	kind "ConsoleApp"
 	targetdir (Bindir)
diff --git a/src/anim.cpp b/src/anim.cpp
index 2517000..2003f1b 100644
--- a/src/anim.cpp
+++ b/src/anim.cpp
@@ -129,9 +129,10 @@ Animation::streamReadLegacy(Stream *stream)
 	HAnimKeyFrame *frames = (HAnimKeyFrame*)anim->keyframes;
 	for(int32 i = 0; i < anim->numFrames; i++){
 		stream->read32(&frames[i].q, 4*4);
+		frames[i].q = conj(frames[i].q);
 		stream->read32(&frames[i].t, 3*4);
 		frames[i].time = stream->readF32();
-		int32 prev = stream->readI32();
+		int32 prev = stream->readI32()/0x24;
 		frames[i].prev = &frames[prev];
 	}
 	return anim;
@@ -159,10 +160,12 @@ Animation::streamWriteLegacy(Stream *stream)
 	assert(interpInfo->id == 1);
 	HAnimKeyFrame *frames = (HAnimKeyFrame*)this->keyframes;
 	for(int32 i = 0; i < this->numFrames; i++){
+		frames[i].q = conj(frames[i].q);
 		stream->write32(&frames[i].q, 4*4);
+		frames[i].q = conj(frames[i].q);
 		stream->write32(&frames[i].t, 3*4);
 		stream->writeF32(frames[i].time);
-		stream->writeI32(frames[i].prev - frames);
+		stream->writeI32((frames[i].prev - frames)*0x24);
 	}
 	return true;
 }
diff --git a/tools/ska2anm/ska2anm.cpp b/tools/ska2anm/ska2anm.cpp
new file mode 100644
index 0000000..900ba82
--- /dev/null
+++ b/tools/ska2anm/ska2anm.cpp
@@ -0,0 +1,83 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include <rw.h>
+#include <args.h>
+
+using namespace rw;
+
+char *argv0;
+
+void
+usage(void)
+{
+	fprintf(stderr, "usage: %s in.ska [out.anm]\n", argv0);
+	fprintf(stderr, "   or: %s in.anm [out.ska]\n", argv0);
+	exit(1);
+}
+
+int
+main(int argc, char *argv[])
+{
+	rw::Engine::init();
+	rw::registerHAnimPlugin();
+	rw::Engine::open(nil);
+	rw::Engine::start();
+
+	ARGBEGIN{
+	case 'v':
+		sscanf(EARGF(usage()), "%x", &rw::version);
+		break;
+	default:
+		usage();
+	}ARGEND;
+
+	if(argc < 1)
+		usage();
+
+	StreamFile stream;
+	if(!stream.open(argv[0], "rb")){
+		fprintf(stderr, "Error: couldn't open %s\n", argv[0]);
+		return 1;
+	}
+
+	int32 firstword = stream.readU32();
+	stream.seek(0, 0);
+	Animation *anim = nil;
+	if(firstword == ID_ANIMANIMATION){
+		// it's an anm file
+		if(findChunk(&stream, ID_ANIMANIMATION, nil, nil))
+			anim = Animation::streamRead(&stream);
+	}else{
+		// it's a ska file
+		anim = Animation::streamReadLegacy(&stream);
+	}
+	stream.close();
+
+	if(anim == nil){
+		fprintf(stderr, "Error: couldn't read anim file\n");
+		return 1;
+	}
+
+	const char *file;
+	if(argc > 1)
+		file = argv[1];
+	else if(firstword == ID_ANIMANIMATION)
+		file = "out.ska";
+	else
+		file = "out.anm";
+	if(!stream.open(file, "wb")){
+		fprintf(stderr, "Error: couldn't open %s\n", file);
+		return 1;
+	}
+	if(firstword == ID_ANIMANIMATION)
+		anim->streamWriteLegacy(&stream);
+	else
+		anim->streamWrite(&stream);
+
+	anim->destroy();
+
+	return 0;
+}