diff --git a/common/web/gesture-recognizer/src/tools/host-fixture/extract-fixture.sh b/common/web/gesture-recognizer/src/tools/host-fixture/extract-fixture.sh
index 075fadc358..49943fb97b 100755
--- a/common/web/gesture-recognizer/src/tools/host-fixture/extract-fixture.sh
+++ b/common/web/gesture-recognizer/src/tools/host-fixture/extract-fixture.sh
@@ -9,7 +9,6 @@ set -eu
 THIS_SCRIPT="$(greadlink -f "${BASH_SOURCE[0]}" 2>/dev/null || readlink -f "${BASH_SOURCE[0]}")"
 cd $(dirname "$THIS_SCRIPT")
 
-FIXTURE_START="    <!-- START: recognizer host fixture -->"
-FIXTURE_END="    <!-- END: recognizer host fixture -->"
-
-sed -n "/$FIXTURE_START/, /$FIXTURE_END/{ /$FIXTURE_START/! { /$FIXTURE_END/! p } }" host-fixture.html
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+# On Windows, `node extractor.js` cannot be directly piped; that requires `node.exe`.
+# But that doesn't make sense on other platforms, so... wrapper script.
+node extractor.js
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diff --git a/common/web/gesture-recognizer/src/tools/host-fixture/extractor.js b/common/web/gesture-recognizer/src/tools/host-fixture/extractor.js
new file mode 100644
index 0000000000..5573ac8e0b
--- /dev/null
+++ b/common/web/gesture-recognizer/src/tools/host-fixture/extractor.js
@@ -0,0 +1,26 @@
+var fs = require('fs');
+var os = require('os');
+
+const args = process.argv.slice(2);
+
+// args[0] - destination file path.  If not provided, the text will be dumped to the console.
+
+fs.readFile('host-fixture.html', 'utf8', function(err, text) {
+  if(err) {
+    throw err;
+  }
+
+  let FIXTURE_START = "    <!-- START: recognizer host fixture -->" + os.EOL;
+  let FIXTURE_END   = "    <!-- END: recognizer host fixture -->" + os.EOL;
+
+  let startIndex = text.indexOf(FIXTURE_START);
+  let endIndex = text.indexOf(FIXTURE_END) + FIXTURE_END.length;
+
+  let desiredText = text.substring(startIndex, endIndex);
+
+  if(args[0]) {
+    fs.writeFileSync(args[0], desiredText);
+  } else {
+    console.log(desiredText);
+  }
+});
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diff --git a/common/web/gesture-recognizer/src/tools/recorder/build.sh b/common/web/gesture-recognizer/src/tools/recorder/build.sh
index bfb2d3cbce..407fad41f6 100755
--- a/common/web/gesture-recognizer/src/tools/recorder/build.sh
+++ b/common/web/gesture-recognizer/src/tools/recorder/build.sh
@@ -34,12 +34,9 @@ build_recorder_page ( ) {
 
   cp ../host-fixture/gestureHost.css  build/gestureHost.css
 
-  FIXTURE=`$FIXTURE_SCRIPT`
-  FIXTURE_TARGET="<!--INSERT_FIXTURE-->"
-
   # Thanks to https://stackoverflow.com/a/10107668 for this tidbit.
   # Searches for FIXTURE_TARGET above and replaces it with the actual fixture!
-  awk -v r="$FIXTURE" "{gsub(/$FIXTURE_TARGET/,r)}1" src/index.html > build/index.html
+  node update-index.js build/index.html
 }
 
 FIXTURE_SCRIPT=../host-fixture/extract-fixture.sh
diff --git a/common/web/gesture-recognizer/src/tools/recorder/update-index.js b/common/web/gesture-recognizer/src/tools/recorder/update-index.js
new file mode 100644
index 0000000000..97f530d6ee
--- /dev/null
+++ b/common/web/gesture-recognizer/src/tools/recorder/update-index.js
@@ -0,0 +1,21 @@
+var fs = require('fs');
+var os = require('os');
+var child_process = require('child_process');
+
+const args = process.argv.slice(2);
+
+// args[0] - destination file path.  If not provided, the text will be dumped to the console.
+
+fs.readFile('src/index.html', 'utf8', function(err, text) {
+  if(err) {
+    throw err;
+  }
+
+  // Runs the fixture-extractor script, receives the fixture's raw HTML.
+  let buf = child_process.execSync("node extractor.js", {cwd: "../host-fixture", windowsHide: true, shell: true}).toString();
+
+  let INSERTION_POINT = "            <!--INSERT_FIXTURE-->" + os.EOL;
+  text = text.replace(INSERTION_POINT, buf);
+
+  fs.writeFileSync(args[0], text);
+});
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