You upgraded to Windows 11, opened a .xlsm file that's worked for years, and now you're staring at a macro error. Maybe it's a compile error. Maybe the macros just silently don't run. Maybe Excel tells you the content is blocked.
This is one of the most common issues we see at LegacyLift. The good news: it's almost always fixable. This guide covers the six most common causes and exactly how to resolve each one.
| Error / Symptom | Most Likely Cause | Jump To |
|---|---|---|
| "Microsoft has blocked macros from running" | Mark of the Web block | Cause 1 |
| "Macros have been disabled" | Trust Center policy | Cause 2 |
| "Compile error in hidden module" | Missing VBA reference | Cause 3 |
| "Compile error: PtrSafe" | 32-bit API in 64-bit Office | Cause 4 |
| Macros run but produce wrong results | Deprecated Windows API | Cause 5 |
| ActiveX control errors | Missing or blocked controls | Cause 6 |
Starting with Office updates in 2022, Microsoft blocks macros in files downloaded from the internet. This is the single most common cause of .xlsm macro errors on Windows 11.
When you download a .xlsm file (from email, a file share, or the web), Windows adds a hidden "Zone.Identifier" alternate data stream that marks the file as internet-sourced. Office reads this flag and blocks macro execution entirely.
For IT teams: If you need to unblock many files at once, use PowerShell:
Get-ChildItem -Path "C:\YourFolder" -Filter "*.xlsm" -Recurse | Unblock-FileFor organizations: Consider adding your file server or SharePoint domain to the Trusted Sites zone via Group Policy, which prevents the MOTW from being applied in the first place.
Even without the MOTW block, Excel's Trust Center settings may be configured to disable macros. Windows 11 fresh installs and Office reinstalls often reset these to the most restrictive defaults.
Alternatively, add the folder containing your .xlsm files as a Trusted Location:
Files in Trusted Locations run macros without any prompts or blocks.
This is the classic "Compile error in hidden module" error. It means your VBA project references a library that either doesn't exist on this machine or has a different version.
Common culprits on Windows 11:
Common substitutions:
| Missing Reference | Replace With |
|---|---|
| Microsoft DAO 3.6 Object Library | Microsoft Office 16.0 Access Database Engine Object Library |
| Microsoft ActiveX Data Objects 2.5 | Microsoft ActiveX Data Objects 6.1 |
| Microsoft Office 14.0 Object Library | Microsoft Office 16.0 Object Library |
If your .xlsm file contains Windows API calls (Declare statements), they must include the PtrSafe keyword when running in 64-bit Office. Windows 11 machines frequently come with 64-bit Office pre-installed, whereas older machines typically had 32-bit.
The error looks like: "Compile error: The code in this project must be updated for use on 64-bit systems."
Find every Declare statement in your VBA code and add PtrSafe:
Before:
Private Declare Function GetTickCount Lib "kernel32" () As LongAfter:
Private Declare PtrSafe Function GetTickCount Lib "kernel32" () As LongIf your code needs to work on both 32-bit and 64-bit, use conditional compilation:
#If VBA7 Then
Private Declare PtrSafe Function GetTickCount Lib "kernel32" () As Long
#Else
Private Declare Function GetTickCount Lib "kernel32" () As Long
#End IfAlso update any Long parameters that represent pointers or handles to LongPtr:
' Before
Declare PtrSafe Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
' After
Declare PtrSafe Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As LongPtrSome Windows APIs that VBA code relies on have been deprecated or behave differently on Windows 11. The macros may run without errors but produce incorrect results or silently fail.
Common examples:
This requires reviewing your VBA code for API calls that may behave differently. There is no universal fix — each case depends on what the API call is trying to accomplish and what the modern equivalent is. For most business workbooks, the Windows API calls handle things like:
Environ("USERPROFILE") or Excel's built-in path functionsApplication.OperatingSystem instead of Win32 APIActiveX controls embedded in Excel worksheets are a frequent source of errors on Windows 11. Microsoft has progressively restricted ActiveX, and Windows 11 continues this trend.
Symptoms include:
%USERPROFILE%\AppData\Local\Temp\Excel8.0\ and %USERPROFILE%\AppData\Local\Temp\VBE\regsvr32 mscomctl.ocx
regsvr32 mscomct2.ocxLegacyLift scans your .xlsm files, identifies every compatibility issue, and auto-fixes what it can. You get a detailed report of everything found and fixed — plus clear guidance on anything that needs manual review.
Once you've fixed the immediate issues, take these steps to avoid the same problems after future Windows updates:
If your .xlsm file has more than 3-4 of the issues above, or if it was originally built in Excel 97-2003 and saved as .xlsm, it may be more efficient to migrate than to patch. Signs you should migrate:
LegacyLift's migration tool handles all of this automatically — scans for every issue, fixes what can be fixed, and generates a clear report on what needs manual attention. Try it on your files.