Microsoft OneNote

Microsoft recently announced that OneNote will now block embedded files that have certain extensions. Until now, OneNote only showed users a dialog warning when opening attachments could harm their computer and data. But users could still open the attachments file with the dangerous extension by selecting OK in the dialog. This change is planned to begin rolling out with Version 2304 in April 2023. The following file extensions will be blocked.

File types blocked in OneNote:

File name extensionFile type
.adeAccess Project Extension (Microsoft)
.adpAccess Project (Microsoft)
.appExecutable Application
.applicationClickOnce Deployment Manifest File
.appref-msClickOnce Application Reference File
.aspActive Server Page
.aspxActive Server Page Extended
.asxASF Redirector File
.basBASIC Source Code
.batBatch Processing
.bgiBorland Graphics Interface
.cabWindows Cabinet File
.cerInternet Security Certificate File
.chmCompiled HTML Help
.cmdDOS CP/M Command File, Command File for Windows NT
.cntMicrosoft Help Workshop Application
.cplWindows Control Panel Extension (Microsoft)
.crtCertificate File
.cshcsh Script
.derDER Encoded X509 Certificate File
.diagcabMicrosoft Diagnostics Cabinet File
.exeExecutable File
.fxpFoxPro Compiled Source (Microsoft)
.gadgetWindows Vista Gadget
.grpMicrosoft Program Group
.hlpWindows Help File
.hpjAppWizard Help project
.htaHypertext Application
.htcHTML Component File
.infInformation or Setup File
.insIIS Internet Communications Settings (Microsoft)
.isoOptical Disk Media File System
.ispIIS Internet Service Provider Settings (Microsoft)
.itsInternet Document Set, Internet Translation
.jarJava Archive
.jnlpJava Network Launching Protocol
.jsJavaScript Source Code
.jseJScript Encoded Script File
.kshUNIX Shell Script
.lnkWindows Shortcut File
.madAccess Module Shortcut (Microsoft)
.mafAccess (Microsoft)
.magAccess Diagram Shortcut (Microsoft)
.mamAccess Macro Shortcut (Microsoft)
.maqAccess Query Shortcut (Microsoft)
.marAccess Report Shortcut (Microsoft)
.masAccess Stored Procedures (Microsoft)
.matAccess Table Shortcut (Microsoft)
.mauMedia Attachment Unit
.mavAccess View Shortcut (Microsoft)
.mawAccess Data Access Page (Microsoft)
.mcfMedia Container Format
.mdaAccess Add-in (Microsoft), MDA Access 2 Workgroup (Microsoft)
.mdbAccess Application (Microsoft), MDB Access Database (Microsoft)
.mdeAccess MDE Database File (Microsoft)
.mdtAccess Add-in Data (Microsoft)
.mdwAccess Workgroup Information (Microsoft)
.mdzAccess Wizard Template (Microsoft)
.mscMicrosoft Management Console Snap-in Control File (Microsoft)
.mshMicrosoft Shell
.msh1Microsoft Shell
.msh2Microsoft Shell
.mshxmlMicrosoft Shell
.msh1xmlMicrosoft Shell
.msh2xmlMicrosoft Shell
.msiWindows Installer File (Microsoft)
.mspWindows Installer Update
.mstWindows SDK Setup Transform Script
.msuWindows Update File
.opsOffice Profile Settings File
.osdOpen Software Description
.pcdVisual Test (Microsoft)
.pifWindows Program Information File (Microsoft)
.plPerl script
.plgDeveloper Studio Build Log
.prfWindows System File
.prgProgram File
.printerexportPrinter backup File
.ps1Windows PowerShell
.ps1xmlWindows PowerShell
.ps2Windows PowerShell
.ps2xmlWindows PowerShell
.psc1Windows PowerShell
.psc2Windows PowerShell
.psd1Windows PowerShell
.psdm1Windows PowerShell
.pstMS Exchange Address Book File, Outlook Personal Folder File (Microsoft)
.pyPython Script
.pycPython Script
.pyoPython Script
.pywPython Script
.pyzPython Script
.pyzwPython Script
.regRegistration Information/Key for W95/98, Registry Data File
.scfWindows Explorer Command
.scrWindows Screen Saver
.sctWindows Script Component, Foxpro Screen (Microsoft)
.shbWindows Shortcut into a Document
.shsShell Scrap Object File
.themeDesktop Theme File Settings
.tmpTemporary File/Folder
.urlInternet Location
.vbVBScript File or Any Visual Basic Source
.vbeVBScript Encoded Script File
.vbpVisual Basic Project File
.vbsVBScript Script File, Visual Basic for Applications Script
.vhdVirtual Hard Disk
.vhdxVirtual Hard Disk Extended
.vsmacrosVisual Studio .NET Binary-based Macro Project (Microsoft)
.vswVisio Workspace File (Microsoft)
.webpnpInternet Printing File
.websitePinned Site Shortcut from Internet Explorer
.wsWindows Script File
.wscWindows Script Component
.wsfWindows Script File
.wshWindows Script Host Settings File
.xbapBrowser Applications
.xllExcel Addin
.xnkExchange Public Folder Shortcut


Find the schedule for this change below:

Update channelVersionRelease date
Current Channel (Preview)Version 2304First half of April 2023
Current ChannelVersion 2304Second half of April 2023
Monthly Enterprise ChannelVersion 2304June 13, 2023
Semi-Annual Enterprise Channel (Preview)Version 2308September 12, 2023
Semi-Annual Enterprise ChannelVersion 2308January 9, 2024