--- a/tools/gfxconv.c	Sat May 12 04:12:46 2018 +0300
+++ b/tools/gfxconv.c	Sat May 12 04:46:08 2018 +0300
@@ -1051,16 +1051,35 @@
         if ((dst->type & D64_FMT_FLI) && (src->type & D64_FMT_FLI) == 0)
         {
             dmMsg(1, "Upconverting multicolor to FLI.\n");
-            for (int i = 0; i < src->nbanks; i++)
+            for (int i = 0; i < dst->nbanks; i++)
             {
                 memcpy(dst->color[i], src->color[0], dst->screenSize);
                 memcpy(dst->screen[i], src->screen[0], dst->screenSize);
+                memcpy(dst->bitmap[i], src->bitmap[0], dst->bitmapSize);
+                memcpy(dst->charmem[i], src->charmem[0], dst->charmemSize);
             }
 
-            for (int i = 0; i < dst->nbanks; i++)
+            for (int i = 0; i < D64_MAX_ENCDEC_OPS; i++)
             {
-                memcpy(dst->bitmap[i], src->bitmap[i], dst->bitmapSize);
-                memcpy(dst->charmem[i], src->charmem[i], dst->charmemSize);
+                const DMC64EncDecOp *op = &fmt->encdecOps[i];
+                size_t size;
+
+                // Check for last operator
+                if (op->type == DT_LAST)
+                    break;
+
+                // Check size
+                if (!dmC64GetOpSize(op, fmt, &size))
+                    return DMERR_INVALID_DATA;
+
+                // Perform operation
+                switch (op->type)
+                {
+                    case DT_EXTRA_DATA:
+                        dst->extraData[op->bank] = dmMalloc0(size);
+                        dst->extraDataSizes[op->bank] = size;
+                        break;
+                }
             }
         }
     }