diff --git a/.github/workflows/master-win.yml b/.github/workflows/master-win.yml
new file mode 100644
index 0000000000..074f944250
--- /dev/null
+++ b/.github/workflows/master-win.yml
@@ -0,0 +1,47 @@
+name: Master Build Windows
+
+on:
+  push:
+    branches: [master]
+
+jobs:
+  build:
+    runs-on: windows-latest
+
+    strategy:
+      matrix:
+        node-version: [12.x]
+
+    env:
+      CI: true
+      NODE_OPTIONS: --max-old-space-size=4096
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: find location of global yarn cache
+        id: yarn-cache
+        run: echo "::set-output name=dir::$(yarn cache dir)"
+      - name: cache global yarn cache
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.yarn-cache.outputs.dir }}
+          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-
+      - name: cache node_modules
+        uses: actions/cache@v2
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-modules-${{ hashFiles('yarn.lock') }}
+      - name: use node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+          registry-url: https://registry.npmjs.org/ # Needed for auth
+
+      - name: yarn install
+        run: yarn install --frozen-lockfile
+
+# Tests are broken on Windows, disabled for now
+      # - name: test
+      #   run: yarn lerna -- run test
diff --git a/.github/workflows/master.yml b/.github/workflows/master.yml
index 3ef0c1fee3..805095ec53 100644
--- a/.github/workflows/master.yml
+++ b/.github/workflows/master.yml
@@ -1,4 +1,4 @@
-name: Master Build
+name: Main Master Build
 
 on:
   push:
diff --git a/packages/docgen/src/docgen/ApiDocGenerator.ts b/packages/docgen/src/docgen/ApiDocGenerator.ts
index bfe449155b..3edcfedb9c 100644
--- a/packages/docgen/src/docgen/ApiDocGenerator.ts
+++ b/packages/docgen/src/docgen/ApiDocGenerator.ts
@@ -15,7 +15,11 @@
  */
 
 import ts from 'typescript';
-import { relative } from 'path';
+import {
+  relative as relativePath,
+  sep as pathSep,
+  posix as posixPath,
+} from 'path';
 import {
   ExportedInstance,
   ApiDoc,
@@ -25,6 +29,12 @@ import {
   TypeLink,
 } from './types';
 
+// Always use unix path separators for the relative file
+// paths, since we'll be using those for HTTP URLs.
+function relativeLink(basePath: string, filePath: string) {
+  return relativePath(basePath, filePath).split(pathSep).join(posixPath.sep);
+}
+
 /**
  * The ApiDocGenerator uses the typescript compiler API to build the data structure that
  * describes a Backstage API and all of it's related types.
@@ -58,7 +68,7 @@ export default class ApiDocGenerator {
 
     const id = this.getObjectPropertyLiteral(info, 'id');
     const description = this.getObjectPropertyLiteral(info, 'description');
-    const file = relative(this.basePath, source.fileName);
+    const file = relativeLink(this.basePath, source.fileName);
     const { line } = source.getLineAndCharacterOfPosition(
       apiInstance.node.getStart(),
     );
@@ -111,7 +121,7 @@ export default class ApiDocGenerator {
     const name = (type.aliasSymbol || type.symbol).name;
     const [declaration] = (type.aliasSymbol || type.symbol).declarations;
     const sourceFile = declaration.getSourceFile();
-    const file = relative(this.basePath, sourceFile.fileName);
+    const file = relativeLink(this.basePath, sourceFile.fileName);
     const { line } = sourceFile.getLineAndCharacterOfPosition(
       declaration.getStart(),
     );
@@ -234,7 +244,7 @@ export default class ApiDocGenerator {
     const { line } = sourceFile.getLineAndCharacterOfPosition(
       declaration.getStart(),
     );
-    const file = relative(this.basePath, sourceFile.fileName);
+    const file = relativeLink(this.basePath, sourceFile.fileName);
     const typeInfo = {
       id: (symbol as any).id,
       name: symbol.name,