Show file extensions on available commands when not .exe (#9099)

Closes #8770

Author: zanieb

crates/uv/src/commands/project/run.rs

@@ -897,7 +897,11 @@ pub(crate) async fn run(
             .map(|entry| entry.path())
             .filter(|path| is_executable(path))
             .map(|path| {
-                if cfg!(windows) {
+                if cfg!(windows)
+                    && path
+                        .extension()
+                        .is_some_and(|exe| exe == std::env::consts::EXE_EXTENSION)
+                {
                     // Remove the extensions.
                     path.with_extension("")
                 } else {

crates/uv/tests/it/run.rs

@@ -248,7 +248,7 @@ fn run_no_args() -> Result<()> {
 
     The following commands are available in the environment:
 
-    - pydoc
+    - pydoc.bat
     - python
     - pythonw