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Add an exclusion to Windows Security

To check if Windows Defender is blocking SigmaXL:

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title	Windows 10 Instructions

Click Start > Settings.
Scroll down and click Update & Security:
Click (1) Windows Security > (2) Virus & threat protection:

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In Image Modified Virus & threat protection settings, select Protection history to view the blocked actions

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Each item in the list can be clicked to expand and to review if SigmaXL/Excel is being blocked by Windows security settings:

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Under Virus & threat protection settings, select Manage settings:

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Scroll down to Exclusions and click Add or remove exclusions:

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Click (1) Add an exclusion, and select (2) File:

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Navigate to the SigmaXL folder, select SigmaXL.xlam and click Open.

For 32-bit: C:\Program Files (x86)\SigmaXL\{version}\SigmaXL.xlam:

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For 64-bit:C:\Program Files\SigmaXL\{version}\SigmaXL.xlam:

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SigmaXL is now being excluded from Windows Defender

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title	Windows 11 Instructions

If Windows Security has incorrectly flagged SigmaXL as untrusted, you can prevent it from blocking it by adding the folder to the exclusions list.

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title	Windows 10 Instructions

Click Start > Settings:
Click Update & Security:
Click Windows Security:
Click Virus & threat protection:
Under Virus & threat protection settings, select Manage settings:
Under Exclusions, select Add or remove exclusions:
Select Add an exclusion, and then select from files, folders, file types, or process. A folder exclusion will apply to all subfolders within the folder as well.