diff --git a/install.cmd b/install.cmd
index 5a3014b..7e3c592 100644
--- a/install.cmd
+++ b/install.cmd
@@ -17,12 +17,15 @@ if not defined PS (
 )
 
 set "TMP_PS=%TEMP%\dosh-install-%RANDOM%-%RANDOM%.ps1"
+set "TMP_BINDIR=%TEMP%\dosh-install-%RANDOM%-%RANDOM%.bindir"
 set "DOSH_INSTALL_PS1_URL=%SCRIPT_URL%"
 set "DOSH_INSTALL_PS1_PATH=%TMP_PS%"
+set "DOSH_INSTALL_BINDIR_FILE=%TMP_BINDIR%"
 
 "%PS%" -NoProfile -ExecutionPolicy Bypass -Command "$ErrorActionPreference='Stop'; $ProgressPreference='SilentlyContinue'; Invoke-WebRequest -UseBasicParsing -Uri $env:DOSH_INSTALL_PS1_URL -OutFile $env:DOSH_INSTALL_PS1_PATH"
 if errorlevel 1 (
     del "%TMP_PS%" >nul 2>nul
+    del "%TMP_BINDIR%" >nul 2>nul
     exit /b 1
 )
 
@@ -30,9 +33,16 @@ if errorlevel 1 (
 set "RC=%ERRORLEVEL%"
 del "%TMP_PS%" >nul 2>nul
 
-set "DOSH_CMD_PREFIX=%PREFIX%"
-if "%DOSH_CMD_PREFIX%"=="" set "DOSH_CMD_PREFIX=%USERPROFILE%\.local"
-set "DOSH_CMD_BINDIR=%DOSH_CMD_PREFIX%\bin"
+if "%RC%"=="0" if exist "%TMP_BINDIR%" (
+    for /f "usebackq delims=" %%D in ("%TMP_BINDIR%") do if not defined DOSH_CMD_BINDIR set "DOSH_CMD_BINDIR=%%D"
+)
+del "%TMP_BINDIR%" >nul 2>nul
+
+if not defined DOSH_CMD_BINDIR (
+    set "DOSH_CMD_PREFIX=%PREFIX%"
+    if "%DOSH_CMD_PREFIX%"=="" set "DOSH_CMD_PREFIX=%USERPROFILE%\.local"
+    set "DOSH_CMD_BINDIR=%DOSH_CMD_PREFIX%\bin"
+)
 set "DOSH_NEXT_PATH=%PATH%"
 if "%RC%"=="0" (
     echo ;%PATH%; | find /I ";%DOSH_CMD_BINDIR%;" >nul 2>nul
diff --git a/install.ps1 b/install.ps1
index f34e7c1..7598142 100644
--- a/install.ps1
+++ b/install.ps1
@@ -458,9 +458,12 @@ function Write-Utf8NoBom($Path, $Content) {
     [System.IO.File]::WriteAllText($Path, $Content, $encoding)
 }
 
-$bindir = Join-Path $Prefix "bin"
-$configDir = Join-Path $HOME ".config\dosh"
+$bindir = Normalize-PathForCompare (Join-Path $Prefix "bin")
+$configDir = Normalize-PathForCompare (Join-Path $HOME ".config\dosh")
 New-Item -ItemType Directory -Force -Path $bindir, $configDir | Out-Null
+if ($env:DOSH_INSTALL_BINDIR_FILE) {
+    Write-Utf8NoBom $env:DOSH_INSTALL_BINDIR_FILE $bindir
+}
 Apply-PendingBinaryReplacements $bindir
 
 function Install-Prebuilt {
diff --git a/tests/release_scripts.rs b/tests/release_scripts.rs
index 8dbcaeb..3d3f6bd 100644
--- a/tests/release_scripts.rs
+++ b/tests/release_scripts.rs
@@ -257,9 +257,14 @@ fn windows_cmd_installer_wraps_native_powershell_installer() {
     assert!(cmd.contains("@echo off"));
     assert!(cmd.contains("https://git.palav.dev/Palav/dosh/raw/branch/main/install.ps1"));
     assert!(cmd.contains("for %%P in (powershell.exe pwsh.exe powershell pwsh) do"));
+    assert!(cmd.contains("set \"TMP_BINDIR=%TEMP%\\dosh-install-%RANDOM%-%RANDOM%.bindir\""));
+    assert!(cmd.contains("set \"DOSH_INSTALL_BINDIR_FILE=%TMP_BINDIR%\""));
     assert!(cmd.contains("Invoke-WebRequest -UseBasicParsing"));
     assert!(cmd.contains("-ExecutionPolicy Bypass -File \"%TMP_PS%\" %*"));
-    assert!(cmd.contains("set \"DOSH_CMD_PREFIX=%PREFIX%\""));
+    assert!(cmd.contains(
+        "for /f \"usebackq delims=\" %%D in (\"%TMP_BINDIR%\") do if not defined DOSH_CMD_BINDIR set \"DOSH_CMD_BINDIR=%%D\""
+    ));
+    assert!(cmd.contains("if not defined DOSH_CMD_BINDIR ("));
     assert!(
         cmd.contains(
             "if \"%DOSH_CMD_PREFIX%\"==\"\" set \"DOSH_CMD_PREFIX=%USERPROFILE%\\.local\""
@@ -363,6 +368,9 @@ fn windows_installer_adds_user_path_idempotently() {
     let ps1 = include_str!("../install.ps1");
     assert!(ps1.contains("function Add-UserPath($PathToAdd)"));
     assert!(ps1.contains("function PathList-Contains($PathValue, $PathToFind)"));
+    assert!(ps1.contains("$bindir = Normalize-PathForCompare (Join-Path $Prefix \"bin\")"));
+    assert!(ps1.contains("if ($env:DOSH_INSTALL_BINDIR_FILE)"));
+    assert!(ps1.contains("Write-Utf8NoBom $env:DOSH_INSTALL_BINDIR_FILE $bindir"));
     assert!(ps1.contains("$wanted = Normalize-PathForCompare $PathToFind"));
     assert!(ps1.contains("foreach ($entry in ($PathValue -split ';' | Where-Object { $_ }))"));
     assert!(ps1.contains("$wanted = Normalize-PathForCompare $PathToAdd"));