From e5222ccdde4a067a1356864fd9c6504f06bdb0a7 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 14 Jul 2023 11:28:56 +0530
Subject: [PATCH] Windows: HTML Input: Fix error when trying to add HTML files
 with links to other files that are invalid pathnames. Fixes #2027763 [Convert
 HTML page to EPUB is no longer
 possible](https://bugs.launchpad.net/calibre/+bug/2027763)

---
 src/calibre/utils/filenames.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/calibre/utils/filenames.py b/src/calibre/utils/filenames.py
index 182fab9c1e..631cf4cbc8 100644
--- a/src/calibre/utils/filenames.py
+++ b/src/calibre/utils/filenames.py
@@ -630,6 +630,10 @@ if iswindows:
             return get_long_path_name(lpath)
         except FileNotFoundError:
             return path
+        except OSError as e:
+            if e.winerror == 123: # ERR_INVALID_NAME
+                return path
+            raise
 
 else:
     def make_long_path_useable(path):