diff --git a/.memory-bank/progress.md b/.memory-bank/progress.md
index d492941..4997c55 100644
--- a/.memory-bank/progress.md
+++ b/.memory-bank/progress.md
@@ -188,6 +188,8 @@ Numbered as agreed with the maintainer; each is documented on its page.
   recurring questions.
 - Review of #17: generic rights are removed the way .NET removes other
   rights, an exact match as it is, otherwise without `Synchronize`.
-- Open bugs: #5 (`-Attributes` matches all, `Get-ChildItem` any; needs a
-  decision), #34 and #67 (writes owner and group), #41 (drive root), #82
-  (`Size` type data), #90 (trailing space).
+- Maintainer decisions of 2026-10-05: #5 (`Get-ChildItem2 -Attributes`
+  matches any listed attribute) and #82 (no `Size` alias) ship in 5.0.0 as
+  breaking changes.
+- Open bugs: #34 and #67 (writes owner and group, rc3 if a file server is
+  available), #41 (drive root) and #90 (trailing space), both after 5.0.0.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4814538..718cb6a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -54,6 +54,10 @@ The format is based on
   that had all of them. To get the old result, filter with `Where-Object`,
   as the cmdlet page shows
   ([#5](https://github.com/raandree/NTFSSecurity/issues/5))
+- **Breaking:** remove the alias `Size` of `LengthOnDisk` from the files of
+  `Get-ChildItem`, which made the import fail in Windows PowerShell when
+  another module had added a `Size` member; use `LengthOnDisk`
+  ([#82](https://github.com/raandree/NTFSSecurity/issues/82))
 
 ### Deprecated
 
diff --git a/Docs/Concepts.md b/Docs/Concepts.md
index 1852861..9ba01cf 100644
--- a/Docs/Concepts.md
+++ b/Docs/Concepts.md
@@ -234,7 +234,7 @@ the AlphaFS objects that the `*-Item2` cmdlets return.
 | --- | --- | --- | --- |
 | `Owner` | Property | Files and folders | The owner of the item. |
 | `IsInheritanceBlocked` | Property | Files and folders | `$true` if the item does not inherit access entries. |
-| `LengthOnDisk` | Property | Files | The file size rounded up to whole clusters of the volume. `Size` is an alias. |
+| `LengthOnDisk` | Property | Files | The file size rounded up to whole clusters of the volume. Before 5.0.0, `Size` was an alias. |
 | `EnableInheritance()` | Method | Files and folders | Turns on access inheritance. |
 | `DisableInheritance()` | Method | Files and folders | Turns off access inheritance. Pass `$false` to drop the inherited entries instead of copying them. |
 | `GetHash()` | Method | Files | Returns the SHA1 hash of the file as a hexadecimal string. |
diff --git a/NTFSSecurity/NTFSSecurity.types.ps1xml b/NTFSSecurity/NTFSSecurity.types.ps1xml
index 4944423..681e8fc 100644
--- a/NTFSSecurity/NTFSSecurity.types.ps1xml
+++ b/NTFSSecurity/NTFSSecurity.types.ps1xml
@@ -23,10 +23,6 @@
           [Math]::Ceiling($this.Length / ($driveInfo.BytesPerSector * $driveInfo.SectorsPerCluster)) * ($driveInfo.BytesPerSector * $driveInfo.SectorsPerCluster)
         </GetScriptBlock>
       </ScriptProperty>
-      <AliasProperty>
-        <Name>Size</Name>
-        <ReferencedMemberName>LengthOnDisk</ReferencedMemberName>
-      </AliasProperty>
       <ScriptMethod>
         <Name>EnableInheritance</Name>
         <Script>
diff --git a/Tests/Manifest.Tests.ps1 b/Tests/Manifest.Tests.ps1
index 087e8e4..1aaf613 100644
--- a/Tests/Manifest.Tests.ps1
+++ b/Tests/Manifest.Tests.ps1
@@ -65,3 +65,19 @@ Describe 'Module manifest of NTFSSecurity' {
         }
     }
 }
+
+Describe 'Type data of NTFSSecurity' {
+    # Before 5.0.0, the types file added the alias Size to System.IO.FileInfo, so the import failed when another module
+    # had added a member with that name (#82). The module is imported in a child process, because type data stays in a
+    # session.
+    It 'Should import after another module added a Size member to System.IO.FileInfo' {
+        $manifestPath = Join-Path -Path $PSScriptRoot -ChildPath '..\NTFSSecurity\bin\Release\NTFSSecurity.psd1'
+        $executable = (Get-Process -Id $PID).Path
+        $command = 'Update-TypeData -TypeName System.IO.FileInfo -MemberType AliasProperty -MemberName Size -Value Length -Force; ' +
+            ("Import-Module -Name '{0}' -ErrorAction Stop; 'IMPORTED'" -f $manifestPath.Replace("'", "''"))
+
+        $output = & $executable -NoProfile -NonInteractive -Command $command 2>&1
+
+        $output | Select-Object -Last 1 | Should -Be 'IMPORTED'
+    }
+}
\ No newline at end of file