diff --git a/js/web-server.js b/js/web-server.js
index e3d38c1c..18179d7f 100644
--- a/js/web-server.js
+++ b/js/web-server.js
@@ -92,7 +92,10 @@ function lastmod(path) {
  * @returns {*}
  */
 function getCachedFile(filePath, cpath, fn) {
-    let cachePath = ".cache/" + cpath.replace(/\//g,'_'),
+    let cachePath = ".cache/" + cpath
+          .replace(/\//g,'_')
+          .replace(/\\/g,'_')
+          .replace(/:/g,'_'),
         cached = fileCache[filePath],
         now = time();
 
@@ -182,9 +185,12 @@ function concatCode(array) {
         filepath;
 
     array.forEach((file, index) => {
-        if (file.charAt(0) === "/") {
+        if (file.charAt(0) === "/" || file.indexOf(":\\") > 0) {
             filepath = file;
-            cachepath = "js_mod" + file.replace(/\//g,'_');
+            cachepath = "js_mod" + file
+                .replace(/\//g,'_')
+                .replace(/\\/g,'_')
+                .replace(/:/g,'_');
             array[index] = cachepath.substring(3).replace('.js','');
             fileMap[cachepath.replace("js_","js/")] = filepath;
         } else {