diff --git a/.env.sample b/.env.sample
index 4e229cfd..6b7bbe2b 100644
--- a/.env.sample
+++ b/.env.sample
@@ -45,3 +45,9 @@ seed=12345
 # can be either "production" or "development"
 # the default value is "production"
 mode=production
+
+# Whether to compress the FTS file with pkware after compiling, or keep it uncompressed
+# can be either "true" or "false"
+# the default value is "false"
+# uncompressed FTS is an Arx Libertatis 1.3+ feature, so it should be disabled when releasing a map
+uncompressedFTS=false
diff --git a/package-lock.json b/package-lock.json
index b8f44235..88edcff5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -41,7 +41,7 @@
         "npm": ">=8.0.0"
       },
       "peerDependencies": {
-        "arx-convert": "^8.2.0",
+        "arx-convert": "^9.0.0",
         "three": "0.158.0"
       }
     },
@@ -880,9 +880,9 @@
       }
     },
     "node_modules/arx-convert": {
-      "version": "8.2.0",
-      "resolved": "https://registry.npmjs.org/arx-convert/-/arx-convert-8.2.0.tgz",
-      "integrity": "sha512-j4/jiPUOXbllIlCAJlB7J6Huh3sT0ZY+2k0VsQXCXto/aUxvBW50Y2y6dTH50yd+L4P5kmf/em3csL0JZbC3HA==",
+      "version": "9.0.0",
+      "resolved": "https://registry.npmjs.org/arx-convert/-/arx-convert-9.0.0.tgz",
+      "integrity": "sha512-VlssE6ljO1KbBbuoFkEb+gun05hhpGEQr75klzh+m0GZ4pzsWZ9mucrqf4azmvfpgCazm7N2Cihl2K+aruyYiw==",
       "peer": true,
       "dependencies": {
         "minimist-lite": "^2.2.1",
@@ -3499,9 +3499,9 @@
       "dev": true
     },
     "arx-convert": {
-      "version": "8.2.0",
-      "resolved": "https://registry.npmjs.org/arx-convert/-/arx-convert-8.2.0.tgz",
-      "integrity": "sha512-j4/jiPUOXbllIlCAJlB7J6Huh3sT0ZY+2k0VsQXCXto/aUxvBW50Y2y6dTH50yd+L4P5kmf/em3csL0JZbC3HA==",
+      "version": "9.0.0",
+      "resolved": "https://registry.npmjs.org/arx-convert/-/arx-convert-9.0.0.tgz",
+      "integrity": "sha512-VlssE6ljO1KbBbuoFkEb+gun05hhpGEQr75klzh+m0GZ4pzsWZ9mucrqf4azmvfpgCazm7N2Cihl2K+aruyYiw==",
       "peer": true,
       "requires": {
         "minimist-lite": "^2.2.1",
diff --git a/package.json b/package.json
index 810cf2bc..bb6c6f03 100644
--- a/package.json
+++ b/package.json
@@ -102,7 +102,7 @@
     "sharp-bmp": "^0.1.5"
   },
   "peerDependencies": {
-    "arx-convert": "^8.2.0",
+    "arx-convert": "^9.0.0",
     "three": "0.158.0"
   },
   "devDependencies": {
@@ -122,4 +122,4 @@
   "keywords": [
     "arx-fatalis"
   ]
-}
+}
\ No newline at end of file
diff --git a/src/Settings.ts b/src/Settings.ts
index 5244653a..4121127e 100644
--- a/src/Settings.ts
+++ b/src/Settings.ts
@@ -91,6 +91,11 @@ type SettingsConstructorProps = {
    * default value is "production"
    */
   mode?: Modes
+  /**
+   * When this is set to true FTS files will not get compressed with pkware
+   * after compiling. This is an Arx Libertatis 1.3+ feature!
+   */
+  uncompressedFTS?: boolean
 }
 
 export class Settings {
@@ -167,6 +172,12 @@ export class Settings {
    */
   readonly internalAssetsDir: string
 
+  /**
+   * When this is set to true FTS files will not get compressed with pkware
+   * after compiling. This is an Arx Libertatis 1.3+ feature!
+   */
+  readonly uncompressedFTS: boolean
+
   constructor(props: SettingsConstructorProps = {}) {
     this.originalLevelFiles =
       props.originalLevelFiles ?? process.env.originalLevelFiles ?? path.resolve('../pkware-test-files')
@@ -186,6 +197,8 @@ export class Settings {
     this.seed = props.seed ?? process.env.seed ?? randomIntBetween(100_000_000, 999_999_999).toString()
     this.mode = props.mode ?? (process.env.mode === 'development' ? process.env.mode : 'production')
 
+    this.uncompressedFTS = props.uncompressedFTS ?? process.env.uncompressedFTS === 'true'
+
     seedrandom(this.seed, { global: true })
 
     const __filename = fileURLToPath(import.meta.url)
diff --git a/src/compile.ts b/src/compile.ts
index 861ba90b..5d1c85cc 100644
--- a/src/compile.ts
+++ b/src/compile.ts
@@ -17,29 +17,36 @@ const compileFTS = async (settings: Settings, fts: ArxFTS) => {
   const ftsPath = path.join(settings.outputDir, `game/graph/levels/level${settings.levelIdx}`)
 
   const repackedFts = FTS.save(fts)
-  const { total: ftsHeaderSize } = getHeaderSize(repackedFts, 'fts')
 
-  return new Promise((resolve, reject) => {
-    const writeStream = fs.createWriteStream(path.join(ftsPath, 'fast.fts'))
-    writeStream
-      .on('close', () => {
-        resolve(true)
-      })
-      .on('error', (e) => {
-        reject(e)
-      })
-    Readable.from(repackedFts)
-      .pipe(
-        through(
-          transformSplitBy(
-            splitAt(ftsHeaderSize),
-            transformIdentity(),
-            implode(Compression.Binary, DictionarySize.Large),
+  if (settings.uncompressedFTS) {
+    return fs.promises.writeFile(path.join(ftsPath, 'fast.fts'), repackedFts)
+  } else {
+    const { total: ftsHeaderSize } = getHeaderSize(repackedFts, 'fts')
+
+    return new Promise((resolve, reject) => {
+      const writeStream = fs.createWriteStream(path.join(ftsPath, 'fast.fts'))
+
+      writeStream
+        .on('close', () => {
+          resolve(true)
+        })
+        .on('error', (e) => {
+          reject(e)
+        })
+
+      Readable.from(repackedFts)
+        .pipe(
+          through(
+            transformSplitBy(
+              splitAt(ftsHeaderSize),
+              transformIdentity(),
+              implode(Compression.Binary, DictionarySize.Large),
+            ),
           ),
-        ),
-      )
-      .pipe(writeStream)
-  })
+        )
+        .pipe(writeStream)
+    })
+  }
 }
 
 const compileLLF = async (settings: Settings, llf: ArxLLF) => {
diff --git a/src/globals.d.ts b/src/globals.d.ts
index 8f4ecf7c..948bd7c3 100644
--- a/src/globals.d.ts
+++ b/src/globals.d.ts
@@ -10,6 +10,7 @@ declare global {
       lightingCalculatorMode?: string
       seed?: string
       mode?: string
+      uncompressedFTS?: string
     }
   }
 }