diff --git a/BakNRet/BakNRet.psd1 b/BakNRet/BakNRet.psd1
index c846c11..d9e9ea1 100644
--- a/BakNRet/BakNRet.psd1
+++ b/BakNRet/BakNRet.psd1
@@ -19,6 +19,7 @@
     CompatiblePSEditions = @('Desktop', 'Core')
 
     FunctionsToExport    = @(
+        'Find-BakNRet7zExecutable',
         'Resolve-BakNRetRootedPath',
         'Test-BakNRetItemSelected',
         'Enter-BakNRetRunLock',
diff --git a/BakNRet/BakNRet.psm1 b/BakNRet/BakNRet.psm1
index 93193f0..03668c3 100644
--- a/BakNRet/BakNRet.psm1
+++ b/BakNRet/BakNRet.psm1
@@ -136,7 +136,10 @@
 . (Join-Path $PSScriptRoot 'Public\Resolve-BakNRetRootedPath.ps1')
 . (Join-Path $PSScriptRoot 'Public\Test-BakNRetItemSelected.ps1')
 
+. (Join-Path $PSScriptRoot 'Public\Find-BakNRet7zExecutable.ps1')
+
 Export-ModuleMember -Function @(
+    'Find-BakNRet7zExecutable',
     'Resolve-BakNRetRootedPath',
     'Test-BakNRetItemSelected',
     'Enter-BakNRetRunLock',
diff --git a/BakNRet/Public/Find-BakNRet7zExecutable.ps1 b/BakNRet/Public/Find-BakNRet7zExecutable.ps1
new file mode 100644
index 0000000..ade45f7
--- /dev/null
+++ b/BakNRet/Public/Find-BakNRet7zExecutable.ps1
@@ -0,0 +1,23 @@
+function Find-BakNRet7zExecutable {
+    <#
+    .SYNOPSIS
+        定位 7z.exe：PATH 优先，其次是两个常见安装位置；找不到返回 $null。
+
+    .DESCRIPTION
+        为什么要单独抽出来：这段查找逻辑原先有两份 —— 模块里的 Resolve-BakNRetCompressionTool
+        有一份，Restore.ps1 里还有一个自带的 Get-7zExecutable。两套写法哪怕只差一个候选路径，
+        就会出现"备份找得到、恢复找不到"这种最难看的不一致。
+
+        注意这里只负责**找 7z**，不负责"找不到怎么办"：那个策略两边本就不同 —— 备份可以退到
+        RAR 或内置 ZIP（能打包就行），而恢复必须真的能解压 7z，找不到就该明确报错。
+    #>
+    $sevenZip = Get-Command 7z -ErrorAction SilentlyContinue |
+        Select-Object -First 1 -ExpandProperty Source
+    if ($sevenZip) { return $sevenZip }
+
+    $candidates = @(
+        (Join-Path $env:ProgramFiles '7-Zip\7z.exe'),
+        (Join-Path ${env:ProgramFiles(x86)} '7-Zip\7z.exe')
+    )
+    return ($candidates | Where-Object { $_ -and (Test-Path -LiteralPath $_) } | Select-Object -First 1)
+}
diff --git a/BakNRet/Public/Resolve-BakNRetCompressionTool.ps1 b/BakNRet/Public/Resolve-BakNRetCompressionTool.ps1
index e80aaa4..bf0a189 100644
--- a/BakNRet/Public/Resolve-BakNRetCompressionTool.ps1
+++ b/BakNRet/Public/Resolve-BakNRetCompressionTool.ps1
@@ -7,15 +7,7 @@
         只返回工具身份，不再返回没人用的 FullArgs / FallbackArgs
         （旧实现里 7z 的那两份参数是死代码，真正的参数由 Get-Optimized7zArgument 生成）。
     #>
-    $sevenZip = Get-Command 7z -ErrorAction SilentlyContinue |
-        Select-Object -First 1 -ExpandProperty Source
-    if (-not $sevenZip) {
-        $candidates = @(
-            (Join-Path $env:ProgramFiles '7-Zip\7z.exe'),
-            (Join-Path ${env:ProgramFiles(x86)} '7-Zip\7z.exe')
-        )
-        $sevenZip = $candidates | Where-Object { $_ -and (Test-Path -LiteralPath $_) } | Select-Object -First 1
-    }
+    $sevenZip = Find-BakNRet7zExecutable
     if ($sevenZip) {
         Write-BakNRetLog '检测到 7z 压缩工具' -Level DEBUG
         return [pscustomobject]@{ Name = '7z'; Command = $sevenZip; Extension = '.7z' }
diff --git a/Restore.ps1 b/Restore.ps1
index 924e020..5d67ec3 100644
--- a/Restore.ps1
+++ b/Restore.ps1
@@ -163,18 +163,6 @@ function Get-ArchiveForEntry {
     return $null
 }
 
-function Get-7zExecutable {
-    <# .SYNOPSIS 定位 7z.exe（PATH 优先，其次是常见安装位置）。 #>
-    $sevenZip = Get-Command 7z -ErrorAction SilentlyContinue | Select-Object -First 1 -ExpandProperty Source
-    if (-not $sevenZip) {
-        $candidates = @(
-            (Join-Path $env:ProgramFiles '7-Zip\7z.exe'),
-            (Join-Path ${env:ProgramFiles(x86)} '7-Zip\7z.exe')
-        )
-        $sevenZip = $candidates | Where-Object { $_ -and (Test-Path -LiteralPath $_) } | Select-Object -First 1
-    }
-    return $sevenZip
-}
 
 function Invoke-ExtractionRaw {
     <#
@@ -197,7 +185,7 @@ function Invoke-ExtractionRaw {
         New-Item -ItemType Directory -Path $Destination -Force | Out-Null
     }
 
-    $sevenZip = Get-7zExecutable
+    $sevenZip = Find-BakNRet7zExecutable
     if ($sevenZip) {
         Write-BakNRetLog '使用 7z 解压' -Level DEBUG
         $argument = @('x', '-bsp2', '-y', "-o$Destination")
@@ -371,7 +359,7 @@ function Test-BakNRetArchivePath {
         [string]$Password
     )
 
-    $sevenZip = Get-7zExecutable
+    $sevenZip = Find-BakNRet7zExecutable
     if (-not $sevenZip) { return $true }   # 没有 7z 时不预判，交给解压分支自己去失败
 
     $item = ([string]$RelativePath).Trim([char[]]@('\', '/'))
@@ -646,7 +634,7 @@ foreach ($line in $lines) {
             Write-BakNRetLog "跳过校验（非 7z）: $($archiveFile.Name)" -Level DEBUG
             continue
         }
-        $verifyTool = Get-7zExecutable
+        $verifyTool = Find-BakNRet7zExecutable
         if (-not $verifyTool) {
             Write-BakNRetLog '未找到 7z，无法校验' -Level ERROR
             $stats.failed++