diff --git a/.gitignore b/.gitignore
index e35cc95..f8a1ca3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,7 @@
 /target
 /.direnv
-/assets/*
-!/assets/.gitkeep
+/assets/build
+/assets/sa
+/assets/mof
 thbgm.dat
 research/dump/*
-!/research/dump/sa/.gitkeep
diff --git a/extract.nu b/extract.nu
index a6259ab..e4dac0f 100644
--- a/extract.nu
+++ b/extract.nu
@@ -9,6 +9,7 @@ def main [game_folder: path, version: int] {
   }
 
   let assets = $"assets/($game.folder)"
+  mkdir $assets
   let thver = $"th($game.version)"
   thdat -C $assets -x $version $"($game_folder)/($thver).dat"
   try {
@@ -16,6 +17,7 @@ def main [game_folder: path, version: int] {
   } catch { }
 
   let research = $"research/dump/($game.folder)"
+  mkdir $research
   let replt = {|ext| str replace $ext $"t($ext)"};
   let dump = {|ext|
     ls $assets | get name | where {str ends-with $".($ext)"} | each {path basename}