unified_routes_windows_fix.patch

diff --git a/packages/gatsby-plugin-page-creator/src/derive-path.ts b/packages/gatsby-plugin-page-creator/src/derive-path.ts
index 4d7a2aa78..4c9070e2c 100644
--- a/packages/gatsby-plugin-page-creator/src/derive-path.ts
+++ b/packages/gatsby-plugin-page-creator/src/derive-path.ts
@@ -5,7 +5,7 @@ import _ from "lodash"
 // src/pages/product/{sku__en} => product/:sku__en pulls from nodes.sku.en
 export function derivePath(path: string, node: Record<string, any>): string {
   // 1.  Remove the extension
-  const pathWithoutExtension = path.replace(/\.[a-z]+$/, ``)
+  let pathWithoutExtension = path.replace(/\.[a-z]+$/, ``)
 
   // 2.  Pull out the slug parts that are within { } brackets.
   const slugParts = /(\{.*\})/g.exec(pathWithoutExtension)
@@ -36,8 +36,8 @@ export function derivePath(path: string, node: Record<string, any>): string {
     }
 
     // 3.d  replace the part of the slug with the actual value
-    path = path.replace(slugPart, value)
+    pathWithoutExtension = pathWithoutExtension.replace(slugPart, value)
   })
 
-  return path
+  return pathWithoutExtension
 }
diff --git a/packages/gatsby-plugin-page-creator/src/extract-query.ts b/packages/gatsby-plugin-page-creator/src/extract-query.ts
index e343cbc7a..4015a270f 100644
--- a/packages/gatsby-plugin-page-creator/src/extract-query.ts
+++ b/packages/gatsby-plugin-page-creator/src/extract-query.ts
@@ -29,7 +29,7 @@ export function reverseLookupParams(
 ): Record<string, string> {
   const reversedParams = {}
 
-  absolutePath.split(`/`).forEach(part => {
+  absolutePath.split(/[\\/]/).forEach(part => {
     const regex = /^\{([a-zA-Z_]+)\}/.exec(part)
 
     if (regex === null) return
@@ -50,7 +50,7 @@ export function reverseLookupParams(
 // to
 //   `id,baz`
 function extractUrlParamsForQuery(createdPath: string): string {
-  const parts = createdPath.split(`/`)
+  const parts = createdPath.split(/[\\/]/)
   return parts
     .reduce<string[]>((queryParts: string[], part: string): string[] => {
       if (part.startsWith(`{`)) {
diff --git a/packages/gatsby-plugin-page-creator/src/get-collection-route-params.ts b/packages/gatsby-plugin-page-creator/src/get-collection-route-params.ts
index da9c0d922..f5064abdc 100644
--- a/packages/gatsby-plugin-page-creator/src/get-collection-route-params.ts
+++ b/packages/gatsby-plugin-page-creator/src/get-collection-route-params.ts
@@ -8,7 +8,7 @@ export function getCollectionRouteParams(
 ): Record<string, string> {
   const params = {}
   // remove the starting path to simplify the loop
-  const fileParts = filePath.split(`/`)
+  const fileParts = filePath.split(/[\\/]/)
   const urlParts = urlPath.split(`/`)
 
   fileParts.forEach((part, i) => {
diff --git a/packages/gatsby/src/utils/js-chunk-names.ts b/packages/gatsby/src/utils/js-chunk-names.ts
index ff19389e2..bb36fdb44 100644
--- a/packages/gatsby/src/utils/js-chunk-names.ts
+++ b/packages/gatsby/src/utils/js-chunk-names.ts
@@ -19,7 +19,7 @@ function replaceUnifiedRoutesKeys(
 ): string {
   let newString = kebabedName
 
-  filePath.split(`/`).forEach(part => {
+  filePath.split(/[\\/]/).forEach(part => {
     if (part[0] === `[` || part[0] === `{`) {
       const match = /(\[(.*)\]|\{(.*)\})/.exec(part)
       newString = newString.replace(