Capitalize the drive letter in windows absolute paths (#727)

src/utils/project_utils.ts

@@ -33,6 +33,10 @@ export async function get_project_dir(): Promise<string | undefined> {
 	}
 	projectFile = file;
 	projectDir = path.dirname(file);
+    if (os.platform() === "win32") {
+        // capitalize the drive letter in windows absolute paths
+        projectDir = projectDir[0].toUpperCase() + projectDir.slice(1);
+    }
 	return projectDir;
 }