Q: Why does Lark Mail block certain types of attachments in emails?
A: To prevent user devices from becoming infected with computer viruses due to infected files, Lark Mail doesn't allow users to upload certain file types, including:
File name extension | File type |
.app | Executable Application |
.bat | Batch Processing |
.chm | Compiled HTML Help, may contents javascripts |
.cmd | DOS CP/M Command File, Command File for Windows NT |
.com | Command |
.cpl | Windows Control Panel Extension (Microsoft) |
.csh | csh Script |
.dll | Executable Dynamic Library |
.exe | Executable File |
.hta | HTML executable file format |
.jar | Java Archive, Executable |
.js | JavaScript Source Code |
.jse | JScript Encoded Script File |
.ksh | UNIX Shell Script |
.lnk | Windows Shortcut File |
.msc | Microsoft Management Console Snap-in Control File (Microsoft) |
.msh | Microsoft Shell |
.msh1 | Microsoft Shell |
.msh2 | Microsoft Shell |
.mshxml | Microsoft Shell |
.msh1xml | Microsoft Shell |
.msh2xml | Microsoft Shell |
.msi | Windows Installer File (Microsoft) |
.msp | Windows Installer Update |
.mst | Windows SDK Setup Transform Script |
.msu | Windows Update file |
.pif | Windows Program Information File (Microsoft), can be Executed |
.pl | Perl script |
.prg | Program File |
.ps1 | Windows PowerShell |
.ps1xml | Windows PowerShell |
.ps2 | Windows PowerShell |
.ps2xml | Windows PowerShell |
.psc2 | Windows PowerShell |
.psd1 | Windows PowerShell |
.psdm1 | Windows PowerShell |
.py | Python script |
.pyc | Python script |
.pyo | Python script |
.pyw | Python script |
.pyz | Python script |
.pyzw | Python script |
.scf | Windows Explorer Command |
.scr | Windows Screen Saver, Executables |
.sct | Windows Script Component, Foxpro Screen (Microsoft) |
.shb | Windows Shortcut into a Document |
.shs | Shell Scrap Object File |
.vb | VBScript File or Any Visual Basic Source |
.vbe | VBScript Encoded Script File |
.vbs | VBScript Script File, Visual Basic for Applications Script |
.ws | Windows Script File |
.wsc | Windows Script Component |
.wsf | Windows Script File |
.wsh | Windows Script Host Settings File |
If Lark Mail users try to upload attachments that are in one of the file formats listed in the table above, the upload will be blocked. If Lark Mail users receive a file that is in one of the file formats listed in the table above, they'll be warned before they open the file.
Q: What can I do if I want to send a file that is in a file format disallowed by Lark Mail?
If you need to send a file with one of these extensions to another Lark user, upload the file to Docs, and then add the Lark user as a collaborator.