diff --git a/Cargo.lock b/Cargo.lock
index b0bb8c25c9..aafaae0f34 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1333,7 +1333,6 @@ dependencies = [
  "popdat",
  "rand",
  "rand_xorshift",
- "rfd",
  "serde",
  "serde_json",
  "sim",
@@ -2303,6 +2302,7 @@ dependencies = [
  "js-sys",
  "log",
  "map_model",
+ "rfd",
  "serde",
  "sim",
  "subprocess",
diff --git a/game/Cargo.toml b/game/Cargo.toml
index 80d35002d4..ef67748573 100644
--- a/game/Cargo.toml
+++ b/game/Cargo.toml
@@ -43,7 +43,6 @@ petname = "1.1.0"
 popdat = { path = "../popdat" }
 rand = "0.8.3"
 rand_xorshift = "0.3.0"
-rfd = "0.2.2"
 serde = "1.0.123"
 serde_json = "1.0.61"
 svg_face = "0.1.3"
diff --git a/game/src/app.rs b/game/src/app.rs
index 7b38a4af82..fdef2e967b 100644
--- a/game/src/app.rs
+++ b/game/src/app.rs
@@ -764,6 +764,7 @@ pub struct SessionState {
     pub tutorial: Option<TutorialState>,
     pub high_scores: BTreeMap<GameplayMode, Vec<HighScore>>,
     pub info_panel_tab: BTreeMap<&'static str, &'static str>,
+    pub last_gmns_timing_csv: Option<String>,
 }
 
 impl SessionState {
@@ -778,6 +779,7 @@ impl SessionState {
                 "person" => "trips",
                 "bus" => "status",
             },
+            last_gmns_timing_csv: None,
         }
     }
 }
diff --git a/game/src/devtools/kml.rs b/game/src/devtools/kml.rs
index ae454b50a7..8ff9221162 100644
--- a/game/src/devtools/kml.rs
+++ b/game/src/devtools/kml.rs
@@ -8,8 +8,7 @@ use abstutil::{prettyprint_usize, Parallelism, Timer};
 use geom::{Circle, Distance, PolyLine, Polygon, Pt2D, Ring};
 use kml::{ExtraShape, ExtraShapes};
 use map_gui::colors::ColorScheme;
-use map_gui::load::FutureLoader;
-use map_gui::tools::PopupMsg;
+use map_gui::tools::{FilePicker, PopupMsg};
 use map_model::BuildingID;
 use widgetry::{
     lctrl, Choice, Color, Drawable, EventCtx, GeomBatch, GfxCtx, HorizontalAlignment, Key, Line,
@@ -403,24 +402,9 @@ fn make_query(app: &App, objects: &[Object], query: &str) -> (GeomBatch, usize)
 }
 
 fn pick_file(ctx: &mut EventCtx, app: &App) -> Transition {
-    let (_, outer_progress_rx) = futures_channel::mpsc::channel(1);
-    let (_, inner_progress_rx) = futures_channel::mpsc::channel(1);
-    let start_dir = app.primary.map.get_city_name().input_path("");
-    Transition::Push(FutureLoader::<App, Option<String>>::new_state(
+    Transition::Push(FilePicker::new_state(
         ctx,
-        Box::pin(async move {
-            let result = rfd::AsyncFileDialog::new()
-                .set_directory(&start_dir)
-                .pick_file()
-                .await
-                .map(|x| x.path().display().to_string());
-            let wrap: Box<dyn Send + FnOnce(&App) -> Option<String>> =
-                Box::new(move |_: &App| result);
-            Ok(wrap)
-        }),
-        outer_progress_rx,
-        inner_progress_rx,
-        "Waiting for a file to be chosen",
+        Some(app.primary.map.get_city_name().input_path("")),
         Box::new(|ctx, app, maybe_path| {
             if let Ok(Some(path)) = maybe_path {
                 Transition::Multi(vec![
diff --git a/game/src/sandbox/gameplay/freeform/grid2demand.rs b/game/src/sandbox/gameplay/freeform/grid2demand.rs
index b5475506af..fe5df24d12 100644
--- a/game/src/sandbox/gameplay/freeform/grid2demand.rs
+++ b/game/src/sandbox/gameplay/freeform/grid2demand.rs
@@ -1,30 +1,16 @@
 // TODO This doesn't really belong in gameplay/freeform
 
-use map_gui::load::FutureLoader;
-use map_gui::tools::{find_exe, RunCommand};
+use map_gui::tools::{find_exe, FilePicker, RunCommand};
 use widgetry::EventCtx;
 
-use crate::app::{App, Transition};
+use crate::app::Transition;
 use crate::sandbox::gameplay::GameplayMode;
 use crate::sandbox::SandboxMode;
 
 pub fn import(ctx: &mut EventCtx) -> Transition {
-    let (_, outer_progress_rx) = futures_channel::mpsc::channel(1);
-    let (_, inner_progress_rx) = futures_channel::mpsc::channel(1);
-    Transition::Push(FutureLoader::<App, Option<String>>::new_state(
+    Transition::Push(FilePicker::new_state(
         ctx,
-        Box::pin(async {
-            let result = rfd::AsyncFileDialog::new()
-                .pick_file()
-                .await
-                .map(|x| x.path().display().to_string());
-            let wrap: Box<dyn Send + FnOnce(&App) -> Option<String>> =
-                Box::new(move |_: &App| result);
-            Ok(wrap)
-        }),
-        outer_progress_rx,
-        inner_progress_rx,
-        "Waiting for a file to be chosen",
+        None,
         Box::new(|ctx, app, maybe_path| {
             if let Ok(Some(path)) = maybe_path {
                 Transition::Replace(RunCommand::new_state(
diff --git a/map_gui/Cargo.toml b/map_gui/Cargo.toml
index 5d69503a70..41f1c5e0e2 100644
--- a/map_gui/Cargo.toml
+++ b/map_gui/Cargo.toml
@@ -27,6 +27,7 @@ instant = "0.1.7"
 js-sys = { version = "0.3.47", optional = true }
 log = "0.4.14"
 map_model = { path = "../map_model" }
+rfd = "0.2.2"
 serde = "1.0.123"
 sim = { path = "../sim" }
 subprocess = { git = "https://github.com/hniksic/rust-subprocess", optional = true }
diff --git a/map_gui/src/tools/mod.rs b/map_gui/src/tools/mod.rs
index fce598c4d5..d0dbf3b14f 100644
--- a/map_gui/src/tools/mod.rs
+++ b/map_gui/src/tools/mod.rs
@@ -12,7 +12,7 @@ pub use self::icons::{goal_marker, start_marker};
 pub use self::minimap::{Minimap, MinimapControls};
 pub use self::navigate::Navigator;
 pub use self::turn_explorer::TurnExplorer;
-pub use self::ui::{ChooseSomething, PopupMsg, PromptInput};
+pub use self::ui::{ChooseSomething, FilePicker, PopupMsg, PromptInput};
 pub use self::url::URLManager;
 use crate::AppLike;
 
diff --git a/map_gui/src/tools/ui.rs b/map_gui/src/tools/ui.rs
index 98546fed34..8a56b1d566 100644
--- a/map_gui/src/tools/ui.rs
+++ b/map_gui/src/tools/ui.rs
@@ -1,10 +1,13 @@
 //! Generic UI tools. Some of this should perhaps be lifted to widgetry.
 
+use anyhow::Result;
+
 use widgetry::{
     hotkeys, Choice, DrawBaselayer, Drawable, EventCtx, GfxCtx, Key, Line, Menu, Outcome, Panel,
     State, Text, TextBox, Transition, Widget,
 };
 
+use crate::load::FutureLoader;
 use crate::tools::grey_out_map;
 use crate::AppLike;
 
@@ -209,3 +212,36 @@ impl<A: AppLike> State<A> for PopupMsg {
         }
     }
 }
+
+pub struct FilePicker;
+
+impl FilePicker {
+    pub fn new_state<A: 'static + AppLike>(
+        ctx: &mut EventCtx,
+        start_dir: Option<String>,
+        on_load: Box<dyn FnOnce(&mut EventCtx, &mut A, Result<Option<String>>) -> Transition<A>>,
+    ) -> Box<dyn State<A>> {
+        let (_, outer_progress_rx) = futures_channel::mpsc::channel(1);
+        let (_, inner_progress_rx) = futures_channel::mpsc::channel(1);
+        FutureLoader::<A, Option<String>>::new_state(
+            ctx,
+            Box::pin(async move {
+                let mut builder = rfd::AsyncFileDialog::new();
+                if let Some(dir) = start_dir {
+                    builder = builder.set_directory(&dir);
+                }
+                let result = builder
+                    .pick_file()
+                    .await
+                    .map(|x| x.path().display().to_string());
+                let wrap: Box<dyn Send + FnOnce(&A) -> Option<String>> =
+                    Box::new(move |_: &A| result);
+                Ok(wrap)
+            }),
+            outer_progress_rx,
+            inner_progress_rx,
+            "Waiting for a file to be chosen",
+            on_load,
+        )
+    }
+}