diff --git a/scripts/build-post-list.js b/scripts/build-post-list.js
index 84fe1caebec1..f0383090550e 100644
--- a/scripts/build-post-list.js
+++ b/scripts/build-post-list.js
@@ -1,5 +1,5 @@
 const { readdirSync, statSync, existsSync, readFileSync, writeFileSync } = require('fs')
-const { resolve, basename } = require('path')
+const { resolve, basename, join, sep } = require('path')
 const frontMatter = require('gray-matter')
 const toc = require('markdown-toc')
 const { slugify } = require('markdown-toc/lib/utils')
@@ -52,10 +52,11 @@ function walkDirectories(directories, result, basePath, sectionWeight = 0, secti
 
     for (let file of files) {
       let details
-      const fileName = [directory, file].join('/')
-      const fileNameWithSection = [fileName, '_section.mdx'].join('/')
-      const slug = fileName.replace(new RegExp(`^${basePath}`), '')
+      const fileName = join(directory, file)
+      const fileNameWithSection = join(fileName, '_section.mdx')
+      const slug = fileName.replace(new RegExp(`^${basePath.replace(/\\/g, sep).replace(/\//g, sep)}`), '').replace(/\\/g, '/');  // Normalize slugs to use `/`
       const slugElements = slug.split('/');
+      
       if (isDirectory(fileName)) {
         if (existsSync(fileNameWithSection)) {
           // Passing a second argument to frontMatter disables cache. See https://github.com/asyncapi/website/issues/1057
@@ -94,7 +95,7 @@ function walkDirectories(directories, result, basePath, sectionWeight = 0, secti
         details.sectionId = sectionId
         details.rootSectionId = rootSectionId
         details.id = fileName
-        details.isIndex = fileName.endsWith('/index.mdx')
+        details.isIndex = fileName.endsWith(join(sep, 'index.mdx'))  // Platform-independent index check
         details.slug = details.isIndex ? sectionSlug : slug.replace(/\.mdx$/, '')
         if (details.slug.includes('/reference/specification/') && !details.title) {
           const fileBaseName = basename(data.slug)  // ex. v2.0.0 | v2.1.0-next-spec.1
@@ -113,7 +114,6 @@ function walkDirectories(directories, result, basePath, sectionWeight = 0, secti
 
           if (fileBaseName.includes('next-spec') || fileBaseName.includes('next-major-spec')) {
             details.isPrerelease = true
-            // this need to be separate because the `-` in "Pre-release" will get removed by `capitalize()` function
             details.title += " (Pre-release)"
           }
           if (fileBaseName.includes('explorer')) {