Not working with Win32 namespaced paths

[parasyte]

Paths with a Win32 namespace look like this: \\?\C:\windows. See https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#win32-file-namespaces for details. Paths of this form are returned by Path::canonicalize() and fs::canonicalize().

When these namespaced paths are used with FileDialog::set_directory(), the dialog opens in the current working directory or the user's documents instead of the requested directory (at least in 0.6.0. The dialog fails to open at all in 0.5.1!)

For instance, this patch:

diff --git a/examples/simple.rs b/examples/simple.rs
index fca64c2..8f7105c 100644
--- a/examples/simple.rs
+++ b/examples/simple.rs
@@ -1,11 +1,9 @@
 #[cfg(not(target_arch = "wasm32"))]
 fn main() {
-    let path = std::env::current_dir().unwrap();
-
     let res = rfd::FileDialog::new()
         .add_filter("text", &["txt", "rs"])
         .add_filter("rust", &["rs", "toml"])
-        .set_directory(&path)
+        .set_directory(r"\\?\C:\windows")
         .pick_files();

     println!("The user choose: {:#?}", res);

Should open the dialog in the C:\windows directory when running the simple example on Windows. Remove the \\?\ namespace prefix and it works as expected.

[PolyMeilex]

So that would mean that IFileDialog::SetFolder does not support namespaced paths.

To be honest, I did not know about existence of namespaced paths before, so I'm not sure how to proceed with this. Can we just strip those?

[parasyte]

I am stripping the prefix to make it work in my app. I can submit a PR.

I also noticed SHCreateItemFromParsingName returns an error with these paths, but it is useless beyond "there was an error".

Error {
    code: 0x80070057,
    message: "The parameter is incorrect.",
    win32_error: 87,
},