diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index e32ff71..8d148d8 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -7,6 +7,10 @@
 - dtmt: split `build` into `build` and `package`
 - dtmt: implement deploying built bundles
 
+=== Fixed
+
+- all: force unix path separators for engine values
+
 == 2023-03-01
 
 === Added
diff --git a/Cargo.lock b/Cargo.lock
index 6e8ff1d..af5a5f6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -676,6 +676,7 @@ dependencies = [
  "dtmt-shared",
  "futures",
  "oodle-sys",
+ "path-slash",
  "sdk",
  "serde",
  "serde_sjson",
@@ -704,6 +705,7 @@ dependencies = [
  "nanorand",
  "oodle-sys",
  "path-clean",
+ "path-slash",
  "pin-project-lite",
  "promptly",
  "sdk",
@@ -1699,6 +1701,12 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "17359afc20d7ab31fdb42bb844c8b3bb1dabd7dcf7e68428492da7f16966fcef"
 
+[[package]]
+name = "path-slash"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e91099d4268b0e11973f036e885d652fb0b21fedcf69738c627f94db6a44f42"
+
 [[package]]
 name = "pbkdf2"
 version = "0.11.0"
@@ -2045,6 +2053,7 @@ dependencies = [
  "luajit2-sys",
  "nanorand",
  "oodle-sys",
+ "path-slash",
  "pin-project-lite",
  "serde",
  "serde_sjson",
diff --git a/crates/dtmm/Cargo.toml b/crates/dtmm/Cargo.toml
index 6516bcc..4719234 100644
--- a/crates/dtmm/Cargo.toml
+++ b/crates/dtmm/Cargo.toml
@@ -23,3 +23,4 @@ tracing-error = "0.2.0"
 tracing-subscriber = { version = "0.3.16", features = ["env-filter"] }
 zip = "0.6.4"
 tokio-stream = { version = "0.1.12", features = ["fs"] }
+path-slash = "0.2.1"
diff --git a/crates/dtmm/src/controller/game.rs b/crates/dtmm/src/controller/game.rs
index 508e84a..a9db26b 100644
--- a/crates/dtmm/src/controller/game.rs
+++ b/crates/dtmm/src/controller/game.rs
@@ -8,6 +8,7 @@ use color_eyre::eyre::Context;
 use color_eyre::{eyre, Help, Result};
 use futures::stream;
 use futures::StreamExt;
+use path_slash::PathBufExt;
 use sdk::filetype::lua;
 use sdk::filetype::package::Package;
 use sdk::murmur::Murmur64;
@@ -153,22 +154,22 @@ fn build_mod_data_lua(state: Arc<State>) -> String {
             lua.push_str("            new_mod(\"");
             lua.push_str(&mod_info.id);
             lua.push_str("\", {\n                mod_script = \"");
-            lua.push_str(&resources.init.to_string_lossy());
+            lua.push_str(&resources.init.to_slash_lossy());
 
             if let Some(data) = resources.data.as_ref() {
                 lua.push_str("\",\n                mod_data = \"");
-                lua.push_str(&data.to_string_lossy());
+                lua.push_str(&data.to_slash_lossy());
             }
 
             if let Some(localization) = &resources.localization {
                 lua.push_str("\",\n                mod_localization = \"");
-                lua.push_str(&localization.to_string_lossy());
+                lua.push_str(&localization.to_slash_lossy());
             }
 
             lua.push_str("\",\n            })\n");
         } else {
             lua.push_str("            return dofile(\"");
-            lua.push_str(&resources.init.to_string_lossy());
+            lua.push_str(&resources.init.to_slash_lossy());
             lua.push_str("\")\n");
         }
 
diff --git a/crates/dtmt/Cargo.toml b/crates/dtmt/Cargo.toml
index 9067ae8..8b210e5 100644
--- a/crates/dtmt/Cargo.toml
+++ b/crates/dtmt/Cargo.toml
@@ -29,6 +29,7 @@ tracing-subscriber = { version = "0.3.16", features = ["env-filter"] }
 tracing = { version = "0.1.37", features = ["async-await"] }
 zip = "0.6.3"
 path-clean = "1.0.1"
+path-slash = "0.2.1"
 
 [dev-dependencies]
 tempfile = "3.3.0"
diff --git a/crates/dtmt/src/cmd/build.rs b/crates/dtmt/src/cmd/build.rs
index f0f6b41..a49c9a1 100644
--- a/crates/dtmt/src/cmd/build.rs
+++ b/crates/dtmt/src/cmd/build.rs
@@ -9,6 +9,7 @@ use color_eyre::{Help, Report};
 use dtmt_shared::ModConfig;
 use futures::future::try_join_all;
 use futures::StreamExt;
+use path_slash::PathExt;
 use sdk::filetype::package::Package;
 use sdk::murmur::IdString64;
 use sdk::{Bundle, BundleFile};
@@ -134,7 +135,7 @@ where
             path.set_extension("");
 
             BundleFile::from_sjson(
-                path.to_string_lossy().to_string(),
+                path.to_slash_lossy().to_string(),
                 file_type,
                 sjson,
                 root.as_ref(),
@@ -176,7 +177,7 @@ where
         .await
         .wrap_err_with(|| format!("failed to read file {}", path.display()))?;
 
-    let pkg_name = package.to_string_lossy().to_string();
+    let pkg_name = package.to_slash_lossy().to_string();
     let pkg = Package::from_sjson(sjson, pkg_name.clone(), root)
         .await
         .wrap_err_with(|| format!("invalid package file {}", &pkg_name))?;
diff --git a/crates/dtmt/src/cmd/package.rs b/crates/dtmt/src/cmd/package.rs
index 44184f6..2a64a9f 100644
--- a/crates/dtmt/src/cmd/package.rs
+++ b/crates/dtmt/src/cmd/package.rs
@@ -5,6 +5,7 @@ use std::path::PathBuf;
 use clap::{value_parser, Arg, ArgMatches, Command};
 use color_eyre::eyre::{Context, Result};
 use color_eyre::Help;
+use path_slash::PathBufExt;
 use tokio::fs::{self, DirEntry};
 use tokio_stream::wrappers::ReadDirStream;
 use tokio_stream::StreamExt;
@@ -88,7 +89,7 @@ pub(crate) async fn run(_ctx: sdk::Context, matches: &ArgMatches) -> Result<()>
             .await
             .wrap_err_with(|| format!("failed to read mod config at {}", path.display()))?;
 
-        zip.start_file(name.to_string_lossy(), Default::default())?;
+        zip.start_file(name.to_slash_lossy(), Default::default())?;
         zip.write_all(&data)?;
     }
 
@@ -111,7 +112,7 @@ pub(crate) async fn run(_ctx: sdk::Context, matches: &ArgMatches) -> Result<()>
             let (name, data) = res?;
 
             let name = base_path.join(name);
-            zip.start_file(name.to_string_lossy(), Default::default())?;
+            zip.start_file(name.to_slash_lossy(), Default::default())?;
             zip.write_all(&data)?;
         }
     };
diff --git a/lib/sdk/Cargo.toml b/lib/sdk/Cargo.toml
index d85b26f..8df7524 100644
--- a/lib/sdk/Cargo.toml
+++ b/lib/sdk/Cargo.toml
@@ -24,3 +24,4 @@ tracing = { version = "0.1.37", features = ["async-await"] }
 tracing-error = "0.2.0"
 luajit2-sys = "0.0.2"
 async-recursion = "1.0.2"
+path-slash = "0.2.1"
diff --git a/lib/sdk/src/filetype/package.rs b/lib/sdk/src/filetype/package.rs
index 338cc8e..9545677 100644
--- a/lib/sdk/src/filetype/package.rs
+++ b/lib/sdk/src/filetype/package.rs
@@ -7,6 +7,7 @@ use std::str::FromStr;
 use async_recursion::async_recursion;
 use color_eyre::eyre::{self, Context};
 use color_eyre::Result;
+use path_slash::PathBufExt;
 use tokio::fs;
 
 use crate::binary::sync::{ReadExt, WriteExt};
@@ -258,7 +259,7 @@ impl Package {
             for path in paths.iter() {
                 w.write_u64(t.hash().into())?;
 
-                let hash = Murmur64::hash(path.to_string_lossy().as_bytes());
+                let hash = Murmur64::hash(path.to_slash_lossy().as_bytes());
                 w.write_u64(hash.into())?;
             }
         }