2 files changed, 49 insertions, 0 deletions
diff --git a/drivers/windows/dir_access_windows.cpp b/drivers/windows/dir_access_windows.cpp
index 26b8881c39..8bf83823a0 100644
--- a/drivers/windows/dir_access_windows.cpp
+++ b/drivers/windows/dir_access_windows.cpp
@@ -32,6 +32,7 @@
 
 #include "dir_access_windows.h"
 
+#include "core/config/project_settings.h"
 #include "core/os/memory.h"
 #include "core/string/print_string.h"
 
@@ -40,6 +41,26 @@
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
+typedef struct _NT_IO_STATUS_BLOCK {
+	union {
+		LONG Status;
+		PVOID Pointer;
+	} DUMMY;
+	ULONG_PTR Information;
+} NT_IO_STATUS_BLOCK;
+
+typedef struct _NT_FILE_CASE_SENSITIVE_INFO {
+	ULONG Flags;
+} NT_FILE_CASE_SENSITIVE_INFO;
+
+typedef enum _NT_FILE_INFORMATION_CLASS {
+	FileCaseSensitiveInformation = 71,
+} NT_FILE_INFORMATION_CLASS;
+
+#define NT_FILE_CS_FLAG_CASE_SENSITIVE_DIR 0x00000001
+
+extern "C" NTSYSAPI LONG NTAPI NtQueryInformationFile(HANDLE FileHandle, NT_IO_STATUS_BLOCK *IoStatusBlock, PVOID FileInformation, ULONG Length, NT_FILE_INFORMATION_CLASS FileInformationClass);
+
 struct DirAccessWindowsPrivate {
 	HANDLE h; // handle for FindFirstFile.
 	WIN32_FIND_DATA f;
@@ -340,6 +361,33 @@ String DirAccessWindows::get_filesystem_type() const {
 	ERR_FAIL_V("");
 }
 
+bool DirAccessWindows::is_case_sensitive(const String &p_path) const {
+	String f = p_path;
+	if (!f.is_absolute_path()) {
+		f = get_current_dir().path_join(f);
+	}
+	f = fix_path(f);
+
+	HANDLE h_file = ::CreateFileW((LPCWSTR)(f.utf16().get_data()), 0,
+			FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+			nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);
+
+	if (h_file == INVALID_HANDLE_VALUE) {
+		return false;
+	}
+
+	NT_IO_STATUS_BLOCK io_status_block;
+	NT_FILE_CASE_SENSITIVE_INFO file_info;
+	LONG out = NtQueryInformationFile(h_file, &io_status_block, &file_info, sizeof(NT_FILE_CASE_SENSITIVE_INFO), FileCaseSensitiveInformation);
+	::CloseHandle(h_file);
+
+	if (out >= 0) {
+		return file_info.Flags & NT_FILE_CS_FLAG_CASE_SENSITIVE_DIR;
+	} else {
+		return false;
+	}
+}
+
 DirAccessWindows::DirAccessWindows() {
 	p = memnew(DirAccessWindowsPrivate);
 	p->h = INVALID_HANDLE_VALUE;
diff --git a/drivers/windows/dir_access_windows.h b/drivers/windows/dir_access_windows.h
index 1e55917756..1dcab84c9d 100644
--- a/drivers/windows/dir_access_windows.h
+++ b/drivers/windows/dir_access_windows.h
@@ -84,6 +84,7 @@ public:
 	uint64_t get_space_left() override;
 
 	virtual String get_filesystem_type() const override;
+	virtual bool is_case_sensitive(const String &p_path) const override;
 
 	DirAccessWindows();
 	~DirAccessWindows();