diff --git a/CHANGELOG.md b/CHANGELOG.md
index ef245b1..04df7a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 All notable changes to Splat Workshop. The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), versions follow [Semantic Versioning](https://semver.org/).
 
+## [Unreleased]
+
+### Fixed
+
+- **Folder names without a dot at the end**: a name like "Tour 12.10." gave the folder `Tour-12.10.`, which Windows file systems (NTFS, e.g. a second disk the runs are moved to) refuse – the copy silently lacked that tour. Now it is `Tour-12.10`. Existing folders keep their names.
+
 ## [0.3.0] – 2026-10-15
 
 ### Added
diff --git a/splat_workshop/config.py b/splat_workshop/config.py
index c319a92..d81a7f5 100644
--- a/splat_workshop/config.py
+++ b/splat_workshop/config.py
@@ -76,7 +76,8 @@ class Config:
 
 
 def slugify(name: str) -> str:
-    """Folder/file name from a display name: ä→ae etc., accents dropped, only [A-Za-z0-9._-]."""
+    """Folder/file name from a display name: ä→ae etc., accents dropped, only [A-Za-z0-9._-]; no dot or
+    dash at the ends ("Tour 12.10." → Tour-12.10: Windows file systems such as NTFS refuse a trailing dot)."""
     for a, b in (("ä", "ae"), ("ö", "oe"), ("ü", "ue"), ("Ä", "Ae"), ("Ö", "Oe"), ("Ü", "Ue"), ("ß", "ss")):
         name = name.replace(a, b)
     name = unicodedata.normalize("NFKD", name).encode("ascii", "ignore").decode()
@@ -88,7 +89,7 @@ def slugify(name: str) -> str:
         elif not dash:
             out.append("-")
             dash = True
-    return "".join(out).strip("-")
+    return "".join(out).strip("-.")
 
 
 def _merge(base: dict, over: dict) -> dict:
diff --git a/tests/test_groups.py b/tests/test_groups.py
index bc22e78..58bc8fa 100644
--- a/tests/test_groups.py
+++ b/tests/test_groups.py
@@ -1,5 +1,6 @@
 """Groups of scenes: one group per scene, suggestions, renaming, cleaning up together."""
 import json
+import pytest
 
 from conftest import RUNS, server
 import synth
@@ -78,3 +79,18 @@ def test_dissolving_a_group_keeps_its_scenes(api):
     assert api.post("/api/delete", {"slug": "Home"})[0] == 200
     assert api.get("/api/groups")[1]["groups"] == []
     assert {"Kitchen", "Hallway", "Statue"} <= {s["slug"] for s in server.scenes()}
+
+
+@pytest.mark.parametrize("name,slug", [("Rundgang 12.10.", "Rundgang-12.10"), ("Küche", "Kueche"),
+                                       ("...", ""), (".hidden", "hidden"), ("Flur 2", "Flur-2")])
+def test_folder_names_suit_every_file_system(name, slug):
+    """No dot at the end: NTFS (e.g. runs on a Windows disk) refuses it, and the copy loses the tour."""
+    from splat_workshop import config
+    assert config.slugify(name) == slug
+
+
+def test_a_tour_named_with_a_date_gets_a_folder_ntfs_accepts(api):
+    synth.make_room(RUNS, "Kitchen", "A", name="Kitchen")
+    synth.make_room(RUNS, "Hall", "B", name="Hall")
+    status, r = api.post("/api/group", {"name": "Tour 12.10.", "members": "Kitchen,Hall"})
+    assert status == 200 and r["slug"] == "Tour-12.10"
diff --git a/tests/test_scenes.py b/tests/test_scenes.py
index 9dca7f7..518db0d 100644
--- a/tests/test_scenes.py
+++ b/tests/test_scenes.py
@@ -23,13 +23,13 @@ def test_renaming_moves_folder_files_and_log(api):
     (run / "aufnahme-12.10.-16-40.gallery.png").write_bytes(b"x")
     status, r = api.post("/api/rename", {"slug": "Aufnahme-12.10.-16-40", "new": "Büro 12.10."})
     assert status == 200, r
-    new = RUNS / "Buero-12.10."
+    new = RUNS / "Buero-12.10"
     assert new.is_dir() and not run.exists()
-    assert (new / "buero-12.10..sog").exists() and (new / "buero-12.10..gallery.png").exists()
-    assert (RUNS / "Buero-12.10..log").exists() and not (RUNS / "Aufnahme-12.10.-16-40.log").exists()
-    meta = json.loads((RUNS / "Buero-12.10..ui.json").read_text())
+    assert (new / "buero-12.10.sog").exists() and (new / "buero-12.10.gallery.png").exists()
+    assert (RUNS / "Buero-12.10.log").exists() and not (RUNS / "Aufnahme-12.10.-16-40.log").exists()
+    meta = json.loads((RUNS / "Buero-12.10.ui.json").read_text())
     assert meta["name"] == "Büro 12.10." and meta["folder_renamed"] is True
-    assert server.no_resume("Buero-12.10.") == "renamed"        # the pipeline remembers the old path
+    assert server.no_resume("Buero-12.10") == "renamed"        # the pipeline remembers the old path
 
 
 def test_renaming_to_a_taken_name_is_refused(api):