diff --git a/web/packages/core/src/load-options.ts b/web/packages/core/src/load-options.ts
index 271c251e0..578850c20 100644
--- a/web/packages/core/src/load-options.ts
+++ b/web/packages/core/src/load-options.ts
@@ -316,4 +316,11 @@ export interface DataLoadOptions extends BaseLoadOptions {
      * The data to load a movie from.
      */
     data: Iterable<number>;
+
+    /**
+     * The filename of the SWF movie to provide to ActionScript.
+     *
+     * @default "movie.swf"
+     */
+    swfFileName?: string;
 }
diff --git a/web/packages/core/src/ruffle-player.ts b/web/packages/core/src/ruffle-player.ts
index a5707ca0e..4cbaaacfc 100644
--- a/web/packages/core/src/ruffle-player.ts
+++ b/web/packages/core/src/ruffle-player.ts
@@ -640,7 +640,8 @@ export class RufflePlayer extends HTMLElement {
                 console.log("Loading SWF data");
                 this.instance!.load_data(
                     new Uint8Array(options.data),
-                    sanitizeParameters(options.parameters)
+                    sanitizeParameters(options.parameters),
+                    options.swfFileName || "movie.swf"
                 );
             }
         } catch (err) {
diff --git a/web/packages/demo/www/index.js b/web/packages/demo/www/index.js
index 2be091fc7..e83678cda 100644
--- a/web/packages/demo/www/index.js
+++ b/web/packages/demo/www/index.js
@@ -144,7 +144,7 @@ async function loadFile(file) {
     }
     hideSample();
     const data = await new Response(file).arrayBuffer();
-    load({ data, ...defaultConfig });
+    load({ data: data, swfFileName: file.name, ...defaultConfig });
 }
 
 function loadSample() {
diff --git a/web/src/lib.rs b/web/src/lib.rs
index 5fc117cfc..2bfc70b2c 100644
--- a/web/src/lib.rs
+++ b/web/src/lib.rs
@@ -29,6 +29,7 @@ use std::{cell::RefCell, error::Error, num::NonZeroI32};
 use tracing_subscriber::layer::{Layered, SubscriberExt};
 use tracing_subscriber::registry::Registry;
 use tracing_wasm::{WASMLayer, WASMLayerConfigBuilder};
+use url::Url;
 use wasm_bindgen::{prelude::*, JsCast, JsValue};
 use web_sys::{
     AddEventListenerOptions, Element, Event, EventTarget, HtmlCanvasElement, HtmlElement,
@@ -240,8 +241,23 @@ impl Ruffle {
     /// Play an arbitrary movie on this instance.
     ///
     /// This method should only be called once per player.
-    pub fn load_data(&mut self, swf_data: Uint8Array, parameters: JsValue) -> Result<(), JsValue> {
-        let mut movie = SwfMovie::from_data(&swf_data.to_vec(), None, None)
+    pub fn load_data(
+        &mut self,
+        swf_data: Uint8Array,
+        parameters: JsValue,
+        swf_name: String,
+    ) -> Result<(), JsValue> {
+        let window = web_sys::window().ok_or("Expected window")?;
+        let mut url = Url::from_str(&window.location().href()?)
+            .map_err(|e| format!("Error creating url: {e}"))?;
+        url.set_query(None);
+        url.set_fragment(None);
+        if let Ok(mut segments) = url.path_segments_mut() {
+            segments.pop();
+            segments.push(&swf_name);
+        }
+
+        let mut movie = SwfMovie::from_data(&swf_data.to_vec(), Some(url.to_string()), None)
             .map_err(|e| format!("Error loading movie: {e}"))?;
         movie.append_parameters(parse_movie_parameters(&parameters));