diff --git a/code/changes/340.fix.rst b/code/changes/340.fix.rst
new file mode 100644
index 00000000..6cac3451
--- /dev/null
+++ b/code/changes/340.fix.rst
@@ -0,0 +1 @@
+Fix handling of Windows URIs in preview code.
diff --git a/code/src/constants.ts b/code/src/constants.ts
index 9c063099..0912c3a9 100644
--- a/code/src/constants.ts
+++ b/code/src/constants.ts
@@ -3,7 +3,7 @@ export const PYTHON_EXTENSION = "ms-python.python"
 
 export namespace Server {
   export const REQUIRED_PYTHON = "3.6.0"
-  export const REQUIRED_VERSION = "0.9.0"
+  export const REQUIRED_VERSION = "0.10.2"
 }
 
 export namespace Commands {
diff --git a/code/src/preview/view.ts b/code/src/preview/view.ts
index fb157fae..878fc489 100644
--- a/code/src/preview/view.ts
+++ b/code/src/preview/view.ts
@@ -121,13 +121,13 @@ export class PreviewManager {
     let buildDir = config.buildDir
     let sourceUri = editor.document.uri
 
-    if (sourceUri.scheme !== 'file' || !sourceUri.path.startsWith(srcDir)) {
+    if (sourceUri.scheme !== 'file' || !sourceUri.fsPath.startsWith(srcDir)) {
       this.logger.debug(`Ignoring ${sourceUri}`)
       return undefined
     }
 
 
-    let rstPath = sourceUri.path.replace(srcDir, '')
+    let rstPath = sourceUri.fsPath.replace(srcDir, '')
     let htmlPath = rstPath.replace(new RegExp(`\\${path.extname(rstPath)}`), '.html')
 
     // Check if the file exists.
diff --git a/lib/esbonio/.bumpversion.cfg b/lib/esbonio/.bumpversion.cfg
index 78f8fe5a..aabb1792 100644
--- a/lib/esbonio/.bumpversion.cfg
+++ b/lib/esbonio/.bumpversion.cfg
@@ -3,7 +3,7 @@ current_version = 0.10.1
 commit = False
 tag = False
 parse = (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)(.dev(?P<dev>\d+))?
-serialize = 
+serialize =
 	{major}.{minor}.{patch}.dev{dev}
 	{major}.{minor}.{patch}
 
diff --git a/lib/esbonio/changes/341.fix.rst b/lib/esbonio/changes/341.fix.rst
new file mode 100644
index 00000000..09f44112
--- /dev/null
+++ b/lib/esbonio/changes/341.fix.rst
@@ -0,0 +1 @@
+Previews on Windows should now start correctly
diff --git a/lib/esbonio/esbonio/lsp/sphinx/__init__.py b/lib/esbonio/esbonio/lsp/sphinx/__init__.py
index 580f1101..149e6c9c 100644
--- a/lib/esbonio/esbonio/lsp/sphinx/__init__.py
+++ b/lib/esbonio/esbonio/lsp/sphinx/__init__.py
@@ -5,6 +5,7 @@
 import traceback
 import typing
 from multiprocessing import Process
+from multiprocessing import Queue
 from typing import Any
 from typing import Dict
 from typing import Iterator
@@ -40,6 +41,7 @@
 from esbonio.lsp.rst import RstLanguageServer
 from esbonio.lsp.rst import ServerConfig
 from esbonio.lsp.sphinx.preview import make_preview_server
+from esbonio.lsp.sphinx.preview import start_preview_server
 
 try:
     from sphinx.util.logging import OnceFilter
@@ -478,7 +480,7 @@ def preview(self, options: Dict[str, Any]) -> Dict[str, Any]:
 
             return {}
 
-        if not self.preview_process:
+        if not self.preview_process and not IS_WIN:
             self.logger.debug("Starting preview server.")
             server = make_preview_server(self.app.outdir)
             self.preview_port = server.server_port
@@ -486,6 +488,16 @@ def preview(self, options: Dict[str, Any]) -> Dict[str, Any]:
             self.preview_process = Process(target=server.serve_forever, daemon=True)
             self.preview_process.start()
 
+        if not self.preview_process and IS_WIN:
+            self.logger.debug("Starting preview server")
+
+            q: Queue = Queue()
+            self.preview_process = Process(
+                target=start_preview_server, args=(q, self.app.outdir), daemon=True
+            )
+            self.preview_process.start()
+            self.preview_port = q.get()
+
         if options.get("show", True):
             self.show_document(
                 ShowDocumentParams(
diff --git a/lib/esbonio/esbonio/lsp/sphinx/preview.py b/lib/esbonio/esbonio/lsp/sphinx/preview.py
index fbf76ee7..dbdd84f9 100644
--- a/lib/esbonio/esbonio/lsp/sphinx/preview.py
+++ b/lib/esbonio/esbonio/lsp/sphinx/preview.py
@@ -2,6 +2,7 @@
 from functools import partial
 from http.server import HTTPServer
 from http.server import SimpleHTTPRequestHandler
+from multiprocessing import Queue
 from typing import Any
 from typing import Type
 
@@ -25,3 +26,16 @@ def make_preview_server(directory: str) -> HTTPServer:
     """Construst a http server that can be used to preview the docs."""
     handler_class = partial(RequestHandler, directory=directory)
     return ServerClass(("localhost", 0), handler_class)
+
+
+def start_preview_server(q: Queue, directory: str):
+    """Start a preview server in the given directory.
+
+    The server's port number will be sent back via the given ``q`` object.
+    """
+
+    handler_class = partial(RequestHandler, directory=directory)
+    server = ServerClass(("localhost", 0), handler_class)
+    q.put(server.server_port)
+
+    server.serve_forever()