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diff --git a/examples/native-echo/Cargo.toml b/examples/native-echo/Cargo.toml
deleted file mode 100644
index 2a3b074..0000000
--- a/examples/native-echo/Cargo.toml
+++ /dev/null
@@ -1,9 +0,0 @@
-[package]
-name = "native-echo"
-version = "0.1.0"
-edition = "2018"
-
-[dependencies]
-stateroom = {path = "../../stateroom"}
-stateroom-server = {path = "../../stateroom-server"}
-tracing-subscriber = {version="0.3.1", features=["fmt", "env-filter"]}
diff --git a/examples/native-echo/src/main.rs b/examples/native-echo/src/main.rs
deleted file mode 100644
index b10a974..0000000
--- a/examples/native-echo/src/main.rs
+++ /dev/null
@@ -1,26 +0,0 @@
-use stateroom::*;
-use stateroom_server::*;
-use tracing_subscriber::EnvFilter;
-
-#[derive(Clone)]
-struct EchoServer;
-
-impl SimpleStateroomService for EchoServer {
-    fn new(_: &str, _: &impl StateroomContext) -> Self {
-        EchoServer
-    }
-
-    fn message(&mut self, client: ClientId, message: &str, ctx: &impl StateroomContext) {
-        ctx.send_message(client, &format!("echo: {}", message));
-    }
-}
-
-fn main() -> std::io::Result<()> {
-    let env_filter = EnvFilter::default().add_directive("info".parse().unwrap());
-
-    tracing_subscriber::fmt().with_env_filter(env_filter).init();
-
-    Server::new().serve(EchoServer)?;
-
-    Ok(())
-}
diff --git a/stateroom-cli/Cargo.toml b/stateroom-cli/Cargo.toml
index bb4ef6f..0038e7b 100644
--- a/stateroom-cli/Cargo.toml
+++ b/stateroom-cli/Cargo.toml
@@ -16,7 +16,6 @@ fs_extra = "1.2.0"
 serde = { version = "1.0.127", features = ["derive"] }
 stateroom = { path="../stateroom", version="0.2.8" }
 stateroom-server = { path="../stateroom-server", version="0.3.0" }
-stateroom-stdio = { path="../stateroom-stdio", version="0.2.8" }
 stateroom-wasm-host = { path="../stateroom-wasm-host", version="0.2.8" }
 toml = "0.8.12"
 tracing = "0.1.28"
diff --git a/stateroom-cli/src/commands/serve.rs b/stateroom-cli/src/commands/serve.rs
index 0f445b8..74bdc01 100644
--- a/stateroom-cli/src/commands/serve.rs
+++ b/stateroom-cli/src/commands/serve.rs
@@ -1,6 +1,5 @@
 use crate::cli_opts::ServeCommand;
 use stateroom_server::Server;
-use stateroom_stdio::StdioProcessServiceFactory;
 use stateroom_wasm_host::WasmHostFactory;
 use std::{ffi::OsStr, path::Path, time::Duration};
 
@@ -29,9 +28,7 @@ pub fn serve(serve_opts: ServeCommand) -> anyhow::Result<()> {
         let host_factory = WasmHostFactory::new(&module)?;
         server_settings.serve(host_factory).map_err(|e| e.into())
     } else if path.is_file() {
-        // Assume that module represents a system process.
-        let host_factory = StdioProcessServiceFactory::new(&module);
-        server_settings.serve(host_factory).map_err(|e| e.into())
+        unimplemented!("Only .wasm and .wat files are supported.");
     } else if path.is_dir() {
         let server_module = path.join("server.wasm");
 
diff --git a/stateroom-stdio/Cargo.toml b/stateroom-stdio/Cargo.toml
deleted file mode 100644
index 1416bb5..0000000
--- a/stateroom-stdio/Cargo.toml
+++ /dev/null
@@ -1,15 +0,0 @@
-[package]
-name = "stateroom-stdio"
-version = "0.2.9"
-edition = "2018"
-readme = "README.md"
-repository = "https://github.com/drifting-in-space/stateroom"
-license = "MIT OR Apache-2.0"
-keywords = ["websocket"]
-description = "Stateroom service that hosts a local system process."
-
-[dependencies]
-interactive_process = "0.1.2"
-stateroom = { path="../stateroom", version="0.2.8", features = ["serde"] }
-serde = { version = "1.0.130", features = ["derive"] }
-serde_json = "1.0.74"
diff --git a/stateroom-stdio/README.md b/stateroom-stdio/README.md
deleted file mode 100644
index 0a0fc0f..0000000
--- a/stateroom-stdio/README.md
+++ /dev/null
@@ -1,6 +0,0 @@
-# `stateroom-stdio`
-
-Stateroom service that hosts a local system process. Messages are sent and
-received by the host as JSON-encoded messages over `stdio`. The format is
-currently undocumented, but see the `stateroom::messages` module for their
-definitions.
diff --git a/stateroom-stdio/src/lib.rs b/stateroom-stdio/src/lib.rs
deleted file mode 100644
index 79f8769..0000000
--- a/stateroom-stdio/src/lib.rs
+++ /dev/null
@@ -1,92 +0,0 @@
-use std::process::Command;
-
-use interactive_process::InteractiveProcess;
-use stateroom::{
-    MessageFromProcess, MessagePayload, MessageToProcess, StateroomContext, StateroomService,
-    StateroomServiceFactory,
-};
-
-pub struct StdioProcessServiceFactory {
-    command: String,
-}
-
-impl StdioProcessServiceFactory {
-    #[must_use]
-    pub fn new(command: &str) -> Self {
-        StdioProcessServiceFactory {
-            command: command.to_string(),
-        }
-    }
-}
-
-impl<T: StateroomContext + Send + Sync + 'static> StateroomServiceFactory<T>
-    for StdioProcessServiceFactory
-{
-    type Service = StdioProcessService;
-    type Error = std::io::Error;
-
-    fn build(&self, _room_id: &str, context: T) -> Result<Self::Service, Self::Error> {
-        let process = InteractiveProcess::new(&mut Command::new(&self.command), move |line| {
-            let line = line.expect("Error reading line from stdin.");
-            let message: MessageFromProcess =
-                serde_json::from_str(&line).expect("Couldn't parse message from process.");
-
-            match message {
-                MessageFromProcess::Message {
-                    recipient,
-                    message: MessagePayload::Bytes(message),
-                } => {
-                    context.send_binary(recipient, &message);
-                }
-                MessageFromProcess::Message {
-                    recipient,
-                    message: MessagePayload::Text(message),
-                } => {
-                    context.send_message(recipient, &message);
-                }
-            }
-        })?;
-
-        Ok(StdioProcessService { process })
-    }
-}
-
-pub struct StdioProcessService {
-    process: InteractiveProcess,
-}
-
-impl StdioProcessService {
-    fn send_to_process(&mut self, message: &MessageToProcess) {
-        self.process
-            .send(&serde_json::to_string(&message).expect("Could not jsonify message."))
-            .expect("Could not send message to process.");
-    }
-}
-
-impl StateroomService for StdioProcessService {
-    fn connect(&mut self, client: stateroom::ClientId) {
-        self.send_to_process(&MessageToProcess::Connect { client });
-    }
-
-    fn disconnect(&mut self, client: stateroom::ClientId) {
-        self.send_to_process(&MessageToProcess::Disconnect { client });
-    }
-
-    fn message(&mut self, sender: stateroom::ClientId, message: &str) {
-        self.send_to_process(&MessageToProcess::Message {
-            client: sender,
-            message: MessagePayload::Text(message.to_string()),
-        });
-    }
-
-    fn binary(&mut self, sender: stateroom::ClientId, message: &[u8]) {
-        self.send_to_process(&MessageToProcess::Message {
-            client: sender,
-            message: MessagePayload::Bytes(message.to_vec()),
-        });
-    }
-
-    fn timer(&mut self) {
-        self.send_to_process(&MessageToProcess::Timer);
-    }
-}