diff --git a/src/uproot_browser/__main__.py b/src/uproot_browser/__main__.py
index 1433f7b..87ecf8d 100644
--- a/src/uproot_browser/__main__.py
+++ b/src/uproot_browser/__main__.py
@@ -7,7 +7,6 @@
 import functools
 import os
 import typing
-from pathlib import Path
 from typing import Any, Callable
 
 import click
@@ -25,15 +24,6 @@
     from click_default_group import DefaultGroup
 
 
-def _existing_path_before_colon(_ctx: object, _value: object, path: str) -> str:
-    prefix, _, _ = path.partition(":")
-    if not Path(prefix).is_file():
-        msg = "{prefix!r} must be an exiting path"
-        raise click.BadParameter(msg)
-
-    return path
-
-
 @click.group(context_settings=CONTEXT_SETTINGS, cls=DefaultGroup, default="browse")
 @click.version_option(version=VERSION)
 def main() -> None:
@@ -43,7 +33,7 @@ def main() -> None:
 
 
 @main.command()
-@click.argument("filename", callback=_existing_path_before_colon)
+@click.argument("filename")
 def tree(filename: str) -> None:
     """
     Display a tree.
@@ -68,7 +58,7 @@ def new_func(*args: Any, **kwargs: Any) -> Any:
 
 
 @main.command()
-@click.argument("filename", callback=_existing_path_before_colon)
+@click.argument("filename")
 @click.option(
     "--iterm", is_flag=True, help="Display an iTerm plot (requires [iterm] extra)."
 )
@@ -85,12 +75,7 @@ def plot(filename: str, iterm: bool) -> None:
     else:
         import uproot_browser.plot  # pylint: disable=import-outside-toplevel
 
-    import uproot_browser.dirs  # pylint: disable=import-outside-toplevel
-
-    fname = uproot_browser.dirs.filename(filename)
-    selections = uproot_browser.dirs.selections(filename)
-    my_tree = uproot.open(fname)
-    *_, item = uproot_browser.dirs.apply_selection(my_tree, selections)
+    item = uproot.open(filename)
 
     if iterm:
         uproot_browser.plot_mpl.plot(item)
@@ -109,18 +94,15 @@ def plot(filename: str, iterm: bool) -> None:
 
 
 @main.command()
-@click.argument("filename", callback=_existing_path_before_colon)
+@click.argument("filename")
 def browse(filename: str) -> None:
     """
     Display a TUI.
     """
-    import uproot_browser.dirs  # pylint: disable=import-outside-toplevel
     import uproot_browser.tui.browser  # pylint: disable=import-outside-toplevel
 
-    fname = uproot_browser.dirs.filename(filename)
-
     app = uproot_browser.tui.browser.Browser(
-        path=Path(fname),
+        path=filename,
     )
 
     app.run()
diff --git a/src/uproot_browser/dirs.py b/src/uproot_browser/dirs.py
deleted file mode 100644
index 7b2559e..0000000
--- a/src/uproot_browser/dirs.py
+++ /dev/null
@@ -1,31 +0,0 @@
-"""
-This holds common functions for accessing a file, ROOT directories, and trees
-split by colons.
-"""
-
-from __future__ import annotations
-
-from typing import Any, Iterable
-
-
-def filename(select: str) -> str:
-    """
-    Return the filename portion of a colon-separated selection.
-    """
-    return select.split(":")[0]
-
-
-def selections(select: str) -> tuple[str, ...]:
-    """
-    Return the directory/tree portion of a colon-separated selection.
-    """
-    return tuple(select.split(":")[1:])
-
-
-def apply_selection(tree: Any, selection: Iterable[str]) -> Iterable[Any]:
-    """
-    Apply a colon-separated selection to an uproot tree. Slashes are handled by uproot.
-    """
-    for sel in selection:
-        tree = tree[sel]
-        yield tree
diff --git a/src/uproot_browser/tui/browser.py b/src/uproot_browser/tui/browser.py
index 42d4bb5..89c57ce 100644
--- a/src/uproot_browser/tui/browser.py
+++ b/src/uproot_browser/tui/browser.py
@@ -5,7 +5,6 @@
 
 import contextlib
 import sys
-from pathlib import Path
 from typing import Any, ClassVar
 
 import plotext as plt
@@ -66,7 +65,7 @@ class Browser(textual.app.App[object]):
 
     show_tree = var(True)
 
-    def __init__(self, path: Path, **kwargs: Any) -> None:
+    def __init__(self, path: str, **kwargs: Any) -> None:
         self.path = path
         super().__init__(**kwargs)
 
@@ -161,10 +160,6 @@ def on_uproot_selected(self, message: UprootSelected) -> None:
 
 
 if __name__ in {"<run_path>", "__main__"}:
-    import uproot_browser.dirs
-
-    fname = uproot_browser.dirs.filename(
-        "../scikit-hep-testdata/src/skhep_testdata/data/uproot-Event.root"
-    )
-    app = Browser(path=Path(fname))
+    fname = "../scikit-hep-testdata/src/skhep_testdata/data/uproot-Event.root"
+    app = Browser(path=fname)
     app.run()
diff --git a/src/uproot_browser/tui/left_panel.py b/src/uproot_browser/tui/left_panel.py
index 5cd734d..ac791be 100644
--- a/src/uproot_browser/tui/left_panel.py
+++ b/src/uproot_browser/tui/left_panel.py
@@ -37,10 +37,11 @@ class UprootTree(textual.widgets.Tree[UprootEntry]):
         textual.binding.Binding("l", "cursor_in", "Cursor in", show=False),
     ]
 
-    def __init__(self, path: Path, **args: Any) -> None:
+    def __init__(self, path: str, **args: Any) -> None:
         self.upfile = uproot.open(path)
+        file_path = Path(self.upfile.file_path)
         data = UprootEntry("/", self.upfile)
-        super().__init__(name=path.name, data=data, label=path.stem, **args)
+        super().__init__(name=str(file_path), data=data, label=file_path.stem, **args)
 
     def render_label(
         self,
diff --git a/src/uproot_browser/tui/right_panel.py b/src/uproot_browser/tui/right_panel.py
index 76461fa..ade4102 100644
--- a/src/uproot_browser/tui/right_panel.py
+++ b/src/uproot_browser/tui/right_panel.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import dataclasses
+from collections.abc import Iterable
 from types import TracebackType
 from typing import Any
 
@@ -34,6 +35,15 @@
 placeholder = np.random.rand(1000)
 
 
+def apply_selection(tree: Any, selection: Iterable[str]) -> Iterable[Any]:
+    """
+    Apply a colon-separated selection to an uproot tree. Slashes are handled by uproot.
+    """
+    for sel in selection:
+        tree = tree[sel]
+        yield tree
+
+
 def make_plot(item: Any, theme: str, *size: int) -> Any:
     plt.clf()
     plt.plotsize(*size)
@@ -52,9 +62,7 @@ class Plotext:
     def __rich_console__(
         self, console: rich.console.Console, options: rich.console.ConsoleOptions
     ) -> rich.console.RenderResult:
-        *_, item = uproot_browser.dirs.apply_selection(
-            self.upfile, self.selection.split(":")
-        )
+        *_, item = apply_selection(self.upfile, self.selection.split(":"))
 
         if item is None:
             yield rich.text.Text()
diff --git a/tests/test_dirs.py b/tests/test_dirs.py
deleted file mode 100644
index 4073132..0000000
--- a/tests/test_dirs.py
+++ /dev/null
@@ -1,16 +0,0 @@
-from __future__ import annotations
-
-from uproot_browser.dirs import filename, selections
-
-
-def test_filename():
-    r"Should handle C:\ too"
-    assert filename("/file.root") == "/file.root"
-    assert filename("/file.root:dir") == "/file.root"
-    assert filename("/file.root:dir:tree") == "/file.root"
-
-
-def test_selection():
-    assert selections("/file.root") == ()
-    assert selections("/file.root:dir") == ("dir",)
-    assert selections("/file.root:dir:tree") == ("dir", "tree")
diff --git a/tests/test_tui.py b/tests/test_tui.py
index b10d21e..03b936d 100644
--- a/tests/test_tui.py
+++ b/tests/test_tui.py
@@ -1,5 +1,3 @@
-from pathlib import Path
-
 import skhep_testdata
 
 from uproot_browser.tui.browser import Browser
@@ -7,14 +5,14 @@
 
 async def test_browse_logo() -> None:
     async with Browser(
-        Path(skhep_testdata.data_path("uproot-Event.root"))
+        skhep_testdata.data_path("uproot-Event.root")
     ).run_test() as pilot:
         assert pilot.app.query_one("#main-view").current == "logo"
 
 
 async def test_browse_plot() -> None:
     async with Browser(
-        Path(skhep_testdata.data_path("uproot-Event.root"))
+        skhep_testdata.data_path("uproot-Event.root")
     ).run_test() as pilot:
         await pilot.press("down", "down", "down", "enter")
         assert pilot.app.query_one("#main-view").current == "plot"
@@ -22,7 +20,7 @@ async def test_browse_plot() -> None:
 
 async def test_browse_empty() -> None:
     async with Browser(
-        Path(skhep_testdata.data_path("uproot-empty.root"))
+        skhep_testdata.data_path("uproot-empty.root")
     ).run_test() as pilot:
         await pilot.press("down", "space", "down", "enter")
         assert pilot.app.query_one("#main-view").current == "empty"
@@ -30,7 +28,7 @@ async def test_browse_empty() -> None:
 
 async def test_browse_empty_vim() -> None:
     async with Browser(
-        Path(skhep_testdata.data_path("uproot-empty.root"))
+        skhep_testdata.data_path("uproot-empty.root")
     ).run_test() as pilot:
         await pilot.press("j", "l", "j", "enter")
         assert pilot.app.query_one("#main-view").current == "empty"
@@ -38,7 +36,7 @@ async def test_browse_empty_vim() -> None:
 
 async def test_help_focus() -> None:
     async with Browser(
-        Path(skhep_testdata.data_path("uproot-empty.root"))
+        skhep_testdata.data_path("uproot-empty.root")
     ).run_test() as pilot:
         await pilot.press("?")
         focus_chain = [widget.id for widget in pilot.app.screen.focus_chain]