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Many types of files are not allowed as attachments to Cloud Mail and Office 365 messages, SharePoint uploads, and Cloud Website uploads.

COHO Cloud empowers you to send, share, collaborate, and publish most common types of files, such as pictures, documents, PDF files, and web content. However, some unusual types of files are not allowed as Cloud Mail or Office 365 (Outlook) attachments, Cloud Websites uploads, or SharePoint files. These types of files are potentially unsafe because they may be designed to harm computers or compromise your privacy.

Cloud Mail Web App, Outlook Online, SharePoint, and Cloud Websites will notify you if a file you attempt to upload or attach is not allowed. If you send (using an app or device) or receive an email message with one of these types of files, it might not be delivered, or the attachment may be removed automatically.

NOTE: Although OneDrive for Business uses SharePoint technology to store your files, it generally does not restrict files by their filename extensions. There are a few file types that OneDrive may reject, and the OneDrive client app will notify you if this happens. Additionally, security software installed on your computer or device may restrict certain files not listed here.

The following file types are not allowed by one or more COHO Cloud services:

Type Description Cloud Mail Office 365 Cloud Website SharePoint
.ade Access Project Extension 🚫 🚫 🚫 🚫
.adp Access Project 🚫 🚫 🚫 🚫
.app Executable Application 🚫 🚫 🚫 🚫
.asp IIS Active Server Page 🚫 🚫 🚫 🚫
.aspx IIS ASP .NET Page 🚫 🚫 🚫 🚫
.asx Windows Media Stream 🚫 🚫 🚫 🚫
.bas BASIC Source Code 🚫 🚫 🚫 🚫
.bash Bash Shell Script 🚫 🚫 🚫 🚫
.bat DOS Batch Script 🚫 🚫 🚫 🚫
.cer SSL Certificate 🚫 🚫 🆗 🚫
.chm Windows Help Compiled HTML 🚫 🚫 🚫 🚫
.cmd Windows Shell Script 🚫 🚫 🚫 🚫
.cnt Windows Help Index 🚫 🚫 🚫 🚫
.com DOS Executable Command 🚫 🚫 🚫 🚫
.cpl Windows Control Panel 🚫 🚫 🚫 🚫
.crt SSL Certificate 🚫 🚫 🆗 🚫
.csh C Shell Script 🚫 🚫 🚫 🚫
.der X509 Certificate 🚫 🚫 🚫 🚫
.exe DOS/Windows Executable Program 🚫 🚫 🚫 🚫
.fxp FoxPro Compiled Source 🚫 🚫 🚫 🚫
.gadget Windows Vista Gadget 🚫 🚫 🚫 🚫
.hlp Windows Legacy Help File 🚫 🚫 🚫 🚫
.hpj Windows Help Project File 🚫 🚫 🚫 🚫
.hta Hypertext Application 🚫 🚫 🚫 🚫
.htc HTML Component File 🚫 🚫 🚫 🚫
.inf Windows Configuration File 🚫 🚫 🚫 🚫
.ins IIS Communications Settings 🚫 🚫 🚫 🚫
.isp IIS Service Provider Settings 🚫 🚫 🚫 🚫
.its Internet Translation Set 🚫 🚫 🚫 🚫
.js JavaScript Source Code 🚫 🚫 🆗 🚫
.jse JScript Encoded Script 🚫 🚫 🚫 🚫
.ksh Korn Shell Script 🚫 🚫 🚫 🚫
.lib Static DLL Information File 🚫 🚫 🚫 🚫
.lnk Windows Shortcut File 🚫 🚫 🚫 🚫
.mad Access Module Shortcut 🚫 🚫 🚫 🚫
.maf Access File 🚫 🚫 🚫 🚫
.mag Access Diagram Shortcut 🚫 🚫 🚫 🚫
.mam Access Macro Shortcut 🚫 🚫 🚫 🚫
.maq Access Query Shortcut 🚫 🚫 🚫 🚫
.mar Access Report Shortcut 🚫 🚫 🚫 🚫
.mas Access Stored Procedure 🚫 🚫 🚫 🚫
.mat Access Table Shortcut 🚫 🚫 🚫 🚫
.mau Access Shortcut Function 🚫 🚫 🚫 🚫
.mav Access View Shortcut 🚫 🚫 🚫 🚫
.maw Access Data Access Page 🚫 🚫 🚫 🚫
.mda Access Add-In 🚫 🚫 🚫 🚫
.mdb Access Database 🚫 🚫 🚫 🚫
.mde Access MDE Database 🚫 🚫 🚫 🚫
.mdt Access Add-In Data 🚫 🚫 🚫 🚫
.mdw Access Workgroup Info 🚫 🚫 🚫 🚫
.mdz Access Wizard Template 🚫 🚫 🚫 🚫
.msc MMC Snap-In Control 🚫 🚫 🚫 🚫
.mht Internet Explorer Archive 🚫 🚫 🚫 🚫
.mhtml Internet Explorer Archive 🚫 🚫 🚫 🚫
.msh 3D Modeling Data 🚫 🚫 🚫 🚫
.msi Windows Installer File 🚫 🚫 🚫 🚫
.msp Windows Installer Patch 🚫 🚫 🚫 🚫
.mst Windows Transformation Script 🚫 🚫 🚫 🚫
.msh1 Windows Help File 🚫 🚫 🚫 🚫
.msh2 Windows Help File 🚫 🚫 🚫 🚫
.msh1xml Windows XML Help File 🚫 🚫 🚫 🚫
.msh2xml Windows XML Help File 🚫 🚫 🚫 🚫
.ops MS Office Profile Settings 🚫 🚫 🚫 🚫
.osd Open Software Description 🚫 🚫 🚫 🚫
.pcd Visual Studio Test 🚫 🚫 🚫 🚫
.pif Windows Program Information 🚫 🚫 🚫 🚫
.plg Aston Shell Plug-In 🚫 🚫 🚫 🚫
.prf Windows System File 🚫 🚫 🚫 🚫
.prg Legacy Program File 🚫 🚫 🚫 🚫
.pst Outlook Personal Folders 🚫 🚫 🚫 🚫
.reg Windows Registry Data 🚫 🚫 🚫 🚫
.scf Windows Explorer Command 🚫 🚫 🚫 🚫
.scr Windows Screen Saver 🚫 🚫 🚫 🚫
.sct Windows Script Component or FoxPro Screen 🚫 🚫 🚫 🚫
.shb Windows Shortcut into Document 🚫 🚫 🚫 🚫
.shs Shell Scrap Object 🚫 🚫 🚫 🚫
.sys Windows System File 🚫 🚫 🚫 🚫
.ps1 PowerShell Script 🚫 🚫 🚫 🚫
.ps1xml PowerShell XML Script 🚫 🚫 🚫 🚫
.ps2 PowerShell Script 🚫 🚫 🚫 🚫
.ps2xml PowerShell XML Script 🚫 🚫 🚫 🚫
.psc1 PowerShell Script 🚫 🚫 🚫 🚫
.psc2 PowerShell Script 🚫 🚫 🚫 🚫
.tmp Temporary File 🚫 🚫 🆗 🚫
.url Internet Location 🚫 🚫 🚫 🚫
.vb Visual Basic Source Code 🚫 🚫 🚫 🚫
.vbe VBA Encoded Script 🚫 🚫 🚫 🚫
.vbs VBA Script 🚫 🚫 🚫 🚫
.vpb Visual Basic Project 🚫 🚫 🚫 🚫
.vsmacros Visual Studio .NET Macro 🚫 🚫 🚫 🚫
.vss Visio Stencil 🚫 🚫 🚫 🚫
.vst Visio Template 🚫 🚫 🚫 🚫
.vsw Visio Workspace 🚫 🚫 🚫 🚫
.vxd Windows Virtual Device Driver 🚫 🚫 🚫 🚫
.ws Windows Script 🚫 🚫 🚫 🚫
.wsc Windows Script Component 🚫 🚫 🚫 🚫
.wsf Windows Script File 🚫 🚫 🚫 🚫
.wsh Windows Script Host Settings 🚫 🚫 🚫 🚫
.xnk Exchange Shortcut 🚫 🚫 🚫 🚫
.xml eXtensible Markup Language 🚫 🚫 🆗 🚫