@ThomasWaldmann I verified map_chars with test_windows_paths.py it correctly maps special characters like *, ?, | to the private use area

Thanks for the PR!

I see some formatting changes - are you using the black version as specified in requirements.d/*.txt?

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.93%. Comparing base (2b5bca4) to head (6430564).
⚠️ Report is 7 commits behind head on master.
✅ All tests successful. No failed tests found.

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@ThomasWaldmann Yes, sorry about that!
I previously used a newer version of black.
I have just updated to black 24.10.0 (as per requirements.d/codestyle.txt), reformatted the code, and force-pushed the changes.

Please also do some manual tests on windows, using borg create, list, extract.

Use different absolute paths, use different drive letters (current drive, other drive).

Did some manual testing:

Test 1: borg create with absolute C:/ paths

$ borg create --list ::test-cdrive C:/Users/trevo/Desktop/Projects/borg/test_drive_letters.py C:/Users/trevo/Desktop/Projects/borg/test_windows_paths.py
A C:/Users/trevo/Desktop/Projects/borg/test_drive_letters.py
A C:/Users/trevo/Desktop/Projects/borg/test_windows_paths.py

Test 2: borg list — Verify path storage

$ borg list ::test-cdrive
-rw-rw-rw- root root 1568 Fri, 2026-02-13 06:58:23 +0530 C/Users/trevo/Desktop/Projects/borg/test_drive_letters.py
-rw-rw-rw- root root 5612 Fri, 2026-02-13 06:46:04 +0530 C/Users/trevo/Desktop/Projects/borg/test_windows_paths.py

C: correctly normalized to C/

Test 3: borg extract — Verify restoration

$ mkdir output && cd output && borg extract ::test-cdrive
$ find . -type f
./C/Users/trevo/Desktop/Projects/borg/test_drive_letters.py
./C/Users/trevo/Desktop/Projects/borg/test_windows_paths.py

Files extracted under C/ directory, contents intact

Test 4: Relative paths (no drive letter)

$ borg create --list ::test-relative test_drive_letters.py test_windows_paths.py
$ borg list ::test-relative
-rw-rw-rw- root root 1568 ... test_drive_letters.py
-rw-rw-rw- root root 5612 ... test_windows_paths.py

No drive prefix added for relative paths

Test 5: /tmp path (resolves to C:/msys64/tmp/)

$ borg create --list ::test-tmpdir /tmp/borg_manual_test/input
A C:/msys64/tmp/borg_manual_test/input/file1.txt
A C:/msys64/tmp/borg_manual_test/input/subdir/nested.txt
A C:/msys64/tmp/borg_manual_test/input/file2.txt

$ borg list ::test-tmpdir
drwxrwxrwx root root    0 ... C/msys64/tmp/borg_manual_test/input
-rw-rw-rw- root root   19 ... C/msys64/tmp/borg_manual_test/input/file1.txt
-rw-rw-rw- root root   13 ... C/msys64/tmp/borg_manual_test/input/file2.txt
-rw-rw-rw- root root   12 ... C/msys64/tmp/borg_manual_test/input/subdir/nested.txt

$ cd output2 && borg extract ::test-tmpdir && find . -type f
./C/msys64/tmp/borg_manual_test/input/file1.txt
./C/msys64/tmp/borg_manual_test/input/file2.txt
./C/msys64/tmp/borg_manual_test/input/subdir/nested.txt

Absolute path through MSYS2 correctly normalized, extract works

Note on different drive letters

I don't have a second physical drive to test with. The unit tests cover C:, D:, E:, and F: drive letters.

That is a bit unusual, but guess it is not due to your changes in this PR:

$ borg create --list ::test-tmpdir /tmp/borg_manual_test/input
A C:/msys64/tmp/borg_manual_test/input/file1.txt

So is /tmp a symlink to /msys64/tmp?

Maybe file an issue for this, guess this should be C/tmp/... in the archive.

OK, merge?

That is a bit unusual, but guess it is not due to your changes in this PR:
$ borg create --list ::test-tmpdir /tmp/borg_manual_test/input
A C:/msys64/tmp/borg_manual_test/input/file1.txt
So is /tmp a symlink to /msys64/tmp?
Maybe file an issue for this, guess this should be C/tmp/... in the archive.

Ill check this out right now and open an issue

Thanks!