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Node cannot handle extended windows paths #62446
Description
Version
v25.1.0
Platform
Microsoft Windows NT 10.0.26200.0 x64
Subsystem
fs
What steps will reproduce the bug?
Running node using an extended path like so: node \\?\C:\absolute\path\to\file.js
How often does it reproduce? Is there a required condition?
Any absolute path prefixed by \\?\
What is the expected behavior? Why is that the expected behavior?
The script is executed; or if the script file does not exist an error stating the file could not be found.
What do you see instead?
node:fs:2710
const out = binding.lstat(base, false, undefined, true /* throwIfNoEntry */);
^
Error: EISDIR: illegal operation on a directory, lstat 'C:'
at Object.realpathSync (node:fs:2710:25)
at toRealPath (node:internal/modules/helpers:62:13)
at Module._findPath (node:internal/modules/cjs/loader:774:22)
at resolveMainPath (node:internal/modules/run_main:35:21)
at Module.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:146:20)
at node:internal/main/run_main_module:33:47 {
errno: -4068,
code: 'EISDIR',
syscall: 'lstat',
path: 'C:'
}
Additional information
This may have been introduced by #55623
Microsoft provide documentation on the path prefixes and semantics here: https://learn.microsoft.com/en-gb/windows/win32/fileio/naming-a-file
Reacted by Viktor Savinov
Activity
fs: handle extended Windows path prefix in realpathSync and realpath
fs: handle extended path on windows
johncrim commentedon Jun 9, 2026
Related:
#60435
#61165
Another PR which provides a simpler fix for those issues. Ideally this PR should handle the
toRealPath()exception too.fs: fix realpath of namespaced drive paths
fs: fix realpath of namespaced drive paths
fs: fix realpath of namespaced drive paths
fs: fix realpath of namespaced drive paths
fs: fix realpath of namespaced drive paths
fs: fix realpath of namespaced drive paths
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