diff --git a/demo/common.h b/demo/common.h
index 9d3d888..37779d4 100644
--- a/demo/common.h
+++ b/demo/common.h
@@ -44,10 +44,24 @@ void write(const char *filename,
         written = fwrite(t, sizeof(unsigned char), size, out);
         fclose(out);
         if (written == 0) {
-            perror("texture write error");
+            perror("write error");
         }
     }
 }
 
 
-
+void append(const char *filename, const char *t, unsigned size) {
+    if (filename == NULL) {
+        return;
+    }
+    unsigned int written = 0;
+    FILE *out = fopen(filename, "ab");
+    if (out != NULL) {
+        written = fwrite(t, sizeof(unsigned char), size, out);
+        fclose(out);
+        if (written == 0) {
+            perror("write error");
+        }
+        printf("wrote %d\n", written);
+    }
+}
diff --git a/demo/extractmesh.c b/demo/extractmesh.c
index 2ce3c6e..6b6a983 100644
--- a/demo/extractmesh.c
+++ b/demo/extractmesh.c
@@ -1,6 +1,20 @@
 #include "common.h"
 #include "devil1geo.h"
 
+void writemesh(struct MeshHeader *mh, struct Mesh *m, const char *filename, unsigned int i) {
+    char *fn = (char*)malloc(strlen(filename) + 3 + 4);
+    sprintf(fn, "%s_%d.msh", filename, i);
+    unsigned int vertices = m -> b -> bd -> numVertex;
+    write(fn, (char*)mh, sizeof(struct MeshHeader));
+    append(fn, (char*)(m -> b -> bd), sizeof(struct BatchData));
+    append(fn, (char*)(m -> b -> vd.positions), sizeof(struct Coordinate)  * vertices);
+    append(fn, (char*)(m -> b -> vd.normals),   sizeof(struct Coordinate)  * vertices);
+    append(fn, (char*)(m -> b -> vd.u),         sizeof(struct UVs)         * vertices);
+    append(fn, (char*)(m -> b -> vd.bi),        sizeof(struct BoneIndexes) * vertices);
+    append(fn, (char*)(m -> b -> vd.bw),        sizeof(struct BoneWeights) * vertices);
+    free(fn);
+}
+
 void extractmeshes(const char *filedata,
                    unsigned int filesize,
                    const char *filename) {
@@ -18,6 +32,7 @@ void extractmeshes(const char *filedata,
         if (m.b != NULL) {
             DEVIL1GEO.getmesh(&m, i, filedata);
             // do something with mesh e.g write to file.
+            writemesh(mh, &m, filename, i);
             free(m.b);
         }
     } // end for
diff --git a/src/devil1geo.c b/src/devil1geo.c
index bf3cfb2..2882bd2 100644
--- a/src/devil1geo.c
+++ b/src/devil1geo.c
@@ -121,3 +121,4 @@ static bool getmesh(struct Mesh *m,
     return done;
 }
 
+