diff --git a/tgui/packages/common/collections.js b/tgui/packages/common/collections.js
index 1e5c978942..b542967d47 100644
--- a/tgui/packages/common/collections.js
+++ b/tgui/packages/common/collections.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 /**
  * Converts a given collection to an array.
  *
diff --git a/tgui/packages/common/fp.js b/tgui/packages/common/fp.js
index 4be45877e2..7aa00a00f3 100644
--- a/tgui/packages/common/fp.js
+++ b/tgui/packages/common/fp.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 /**
  * Creates a function that returns the result of invoking the given
  * functions, where each successive invocation is supplied the return
diff --git a/tgui/packages/common/logging.js b/tgui/packages/common/logging.js
index 4ae1855fda..0dc222ae3d 100644
--- a/tgui/packages/common/logging.js
+++ b/tgui/packages/common/logging.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 const inception = Date.now();
 
 // Runtime detection
diff --git a/tgui/packages/common/math.js b/tgui/packages/common/math.js
index cc7a309563..c3013b5a32 100644
--- a/tgui/packages/common/math.js
+++ b/tgui/packages/common/math.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 /**
  * Limits a number to the range between 'min' and 'max'.
  */
diff --git a/tgui/packages/common/react.js b/tgui/packages/common/react.js
index 0828bb8864..dba84b7b10 100644
--- a/tgui/packages/common/react.js
+++ b/tgui/packages/common/react.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 /**
  * Helper for conditionally adding/removing classes in React
  *
diff --git a/tgui/packages/common/redux.js b/tgui/packages/common/redux.js
index 257a9eebf5..7fb4432408 100644
--- a/tgui/packages/common/redux.js
+++ b/tgui/packages/common/redux.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 import { compose } from './fp';
 
 /**
diff --git a/tgui/packages/common/string.babel-plugin.cjs b/tgui/packages/common/string.babel-plugin.cjs
index ba25e3f91d..68295aefcf 100644
--- a/tgui/packages/common/string.babel-plugin.cjs
+++ b/tgui/packages/common/string.babel-plugin.cjs
@@ -1,5 +1,7 @@
 /**
- * @file
+ * This plugin saves overall about 10KB on the final bundle size, so it's
+ * sort of worth it.
+ *
  * We are using a .cjs extension because:
  *
  * 1. Webpack CLI only supports CommonJS modules;
@@ -9,8 +11,9 @@
  * We need to copy-paste the whole "multiline" function because we can't
  * synchronously import an ES module from a CommonJS module.
  *
- * This plugin saves overall about 10KB on the final bundle size, so it's
- * sort of worth it.
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
  */
 
 /**
diff --git a/tgui/packages/common/string.js b/tgui/packages/common/string.js
index d05dbfb6fc..16a0921a25 100644
--- a/tgui/packages/common/string.js
+++ b/tgui/packages/common/string.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 /**
  * Removes excess whitespace and indentation from the string.
  */
diff --git a/tgui/packages/common/timer.js b/tgui/packages/common/timer.js
index e3feb69ca9..f4e26fa5aa 100644
--- a/tgui/packages/common/timer.js
+++ b/tgui/packages/common/timer.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 /**
  * Returns a function, that, as long as it continues to be invoked, will
  * not be triggered. The function will be called after it stops being
diff --git a/tgui/packages/common/vector.js b/tgui/packages/common/vector.js
index fa98597896..1562df5991 100644
--- a/tgui/packages/common/vector.js
+++ b/tgui/packages/common/vector.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 import { map, reduce, zipWith } from './collections';
 
 /**
diff --git a/tgui/packages/tgui-dev-server/index.js b/tgui/packages/tgui-dev-server/index.js
index 1e7683080c..f4e8155d29 100644
--- a/tgui/packages/tgui-dev-server/index.js
+++ b/tgui/packages/tgui-dev-server/index.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 import { setupWebpack, getWebpackConfig } from './webpack.js';
 import { reloadByondCache } from './reloader.js';
 
diff --git a/tgui/packages/tgui-dev-server/link/client.js b/tgui/packages/tgui-dev-server/link/client.js
index 774b7ed6db..af7a920c64 100644
--- a/tgui/packages/tgui-dev-server/link/client.js
+++ b/tgui/packages/tgui-dev-server/link/client.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 let socket;
 const queue = [];
 const subscribers = [];
diff --git a/tgui/packages/tgui-dev-server/link/retrace.js b/tgui/packages/tgui-dev-server/link/retrace.js
index 74c87e6a55..e0b17a01d6 100644
--- a/tgui/packages/tgui-dev-server/link/retrace.js
+++ b/tgui/packages/tgui-dev-server/link/retrace.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 import { createLogger } from 'common/logging.js';
 import fs from 'fs';
 import { basename } from 'path';
diff --git a/tgui/packages/tgui-dev-server/link/server.js b/tgui/packages/tgui-dev-server/link/server.js
index 84f3700048..94a79c9ad5 100644
--- a/tgui/packages/tgui-dev-server/link/server.js
+++ b/tgui/packages/tgui-dev-server/link/server.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 import { createLogger, directLog } from 'common/logging.js';
 import http from 'http';
 import { inspect } from 'util';
diff --git a/tgui/packages/tgui-dev-server/reloader.js b/tgui/packages/tgui-dev-server/reloader.js
index 394e55afdb..e33f7226b9 100644
--- a/tgui/packages/tgui-dev-server/reloader.js
+++ b/tgui/packages/tgui-dev-server/reloader.js
@@ -1,9 +1,16 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 import { createLogger } from 'common/logging.js';
 import fs from 'fs';
 import os from 'os';
 import { basename } from 'path';
 import { promisify } from 'util';
 import { resolveGlob, resolvePath } from './util.js';
+import { regQuery } from './winreg.js';
 
 const logger = createLogger('reloader');
 
@@ -40,6 +47,21 @@ export const findCacheRoot = async () => {
       return cacheRoot;
     }
   }
+  // Query the Windows Registry
+  if (process.platform === 'win32') {
+    logger.log('querying windows registry');
+    let userpath = await regQuery(
+      'HKCU\\Software\\Dantom\\BYOND',
+      'userpath');
+    if (userpath) {
+      cacheRoot = userpath
+        .replace(/\\$/, '')
+        .replace(/\\/g, '/')
+        + '/cache';
+      logger.log(`found cache at '${cacheRoot}'`);
+      return cacheRoot;
+    }
+  }
   logger.log('found no cache directories');
 };
 
diff --git a/tgui/packages/tgui-dev-server/util.js b/tgui/packages/tgui-dev-server/util.js
index db34626721..50c0baad5a 100644
--- a/tgui/packages/tgui-dev-server/util.js
+++ b/tgui/packages/tgui-dev-server/util.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 import glob from 'glob';
 import { resolve as resolvePath } from 'path';
 import fs from 'fs';
diff --git a/tgui/packages/tgui-dev-server/webpack.js b/tgui/packages/tgui-dev-server/webpack.js
index 778469a15b..c625827409 100644
--- a/tgui/packages/tgui-dev-server/webpack.js
+++ b/tgui/packages/tgui-dev-server/webpack.js
@@ -1,3 +1,9 @@
+/**
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
 import { createLogger } from 'common/logging.js';
 import fs from 'fs';
 import { createRequire } from 'module';
diff --git a/tgui/packages/tgui-dev-server/winreg.js b/tgui/packages/tgui-dev-server/winreg.js
new file mode 100644
index 0000000000..974135e76d
--- /dev/null
+++ b/tgui/packages/tgui-dev-server/winreg.js
@@ -0,0 +1,47 @@
+/**
+ * Tools for dealing with Windows Registry bullshit.
+ *
+ * @file
+ * @copyright 2020 Aleksej Komarov
+ * @license MIT
+ */
+
+import { exec } from 'child_process';
+import { createLogger } from 'common/logging.js';
+import { promisify } from 'util';
+
+const logger = createLogger('winreg');
+
+export const regQuery = async (path, key) => {
+  if (process.platform !== 'win32') {
+    return null;
+  }
+  try {
+    const command = `reg query "${path}" /v ${key}`;
+    const { stdout } = await promisify(exec)(command);
+    const keyPattern = `    ${key}    `;
+    const indexOfKey = stdout.indexOf(keyPattern);
+    if (indexOfKey === -1) {
+      logger.error('could not find the registry key');
+      return null;
+    }
+    const indexOfEol = stdout.indexOf('\r\n', indexOfKey);
+    if (indexOfEol === -1) {
+      logger.error('could not find the end of the line');
+      return null;
+    }
+    const indexOfValue = stdout.indexOf(
+      '    ',
+      indexOfKey + keyPattern.length);
+    if (indexOfValue === -1) {
+      logger.error('could not find the start of the key value');
+      return null;
+    }
+    const value = stdout.substring(indexOfValue + 4, indexOfEol);
+    return value;
+  }
+  catch (err) {
+    logger.error(err);
+    return null;
+  }
+};