Blocked File Extensions in SharePoint
The following article contains a list of file extensions that are blocked by SharePoint by default. Allowing these files to be uploaded to your SharePoint site can create a security risk for your SharePoint site as well as the SharePoint server.
| Extension | Description |
| .ade | Microsoft Access project extension |
| .adp | Microsoft Access project |
| .app | Application file |
| .asa | ASP declarations file |
| .ashx | ASP.NET Web handler file. |
| .asmx | ASP.NET Web Services source file |
| .asp | Active Server Pages |
| .bas | Microsoft Visual Basic class module |
| .bat | Batch file |
| .cdx | Compound index |
| .cer | Certificate file |
| .chm | Compiled HTML Help file |
| .class | Java class file |
| .cmd | Microsoft Windows NT command script |
| .com | Microsoft MS-DOS program |
| .config | Configuration file |
| .cpl | Control Panel extension |
| .crt | Security certificate |
| .csh | Script file |
| .dll | Windows dynamic link library |
| .exe | Program |
| .fxp | Microsoft Visual FoxPro compiled program |
| .hlp | Help file |
| .hta | HTML program |
| .htr | Script file |
| .htw | HTML document |
| .ida | Internet Information Services file |
| .idc | Internet database connector file |
| .idq | Internet data query file |
| .ins | Internet Naming Service |
| .isp | Internet Communication settings |
| .its | Internet Document Set file |
| .jse | JScript Encoded script file |
| .ksh | Korn Shell script file |
| .lnk | Shortcut |
| .mad | Shortcut |
| .maf | Shortcut |
| .mag | Shortcut |
| .mam | Shortcut |
| .maq | Shortcut |
| .mar | Shortcut |
| .mas | Microsoft Access stored procedure |
| .mat | Shortcut |
| .mau | Shortcut |
| .mav | Shortcut |
| .maw | Shortcut |
| .mda | Microsoft Access add-in program |
| .mdb | Microsoft Access program |
| .mde | Microsoft Access MDE database |
| .mdt | Microsoft Access data file |
| .mdw | Microsoft Access workgroup |
| .mdz | Microsoft Access wizard program |
| .msc | Microsoft Common Console document |
| .msh | Microsoft Agent script helper |
| .msh1 | Microsoft Agent script helper |
| .msh1xml | Microsoft Agent script helper |
| .msh2 | Microsoft Agent script helper |
| .msh2xml | Microsoft Agent script helper |
| .mshxml | Microsoft Agent script helper |
| .msi | Microsoft Windows Installer package |
| .msp | Windows Installer patch package file |
| .mst | Visual Test source files |
| .ops | Microsoft Office profile settings file |
| .pcd | Photo CD image or Microsoft Visual Test compiled script |
| .pif | Shortcut to MS-DOS program |
| .prf | System file |
| .prg | Program source file |
| .printer | Printer file |
| .pst | Microsoft Outlook personal folder file |
| .reg | Registration entries |
| .rem | ACT! database maintenance file |
| .scf | Windows Explorer command file |
| .scr | Screen saver |
| .sct | Script file |
| .shb | Windows shortcut |
| .shs | Shell Scrap object |
| .shtm | HTML file that contains server side directives |
| .shtml | HTML file that contains server side directives |
| .soap | Simple Object Access Protocol file |
| .stm | HTML file that contains server side directives |
| .url | Uniform Resource Locator (Internet shortcut) |
| .vb | Microsoft Visual Basic Scripting Edition file |
| .vbe | VBScript Encoded Script file |
| .vbs | VBScript file |
| .ws | Windows Script file |
| .wsc | Windows Script Component |
| .wsf | Windows Script file |
| .wsh | Windows Script Host settings file |
The above descriptions were taken from Microsoft Office Online.
