The following file types are unsupported in Synthesis 6 and may not be uploaded to posts, pages, or libraries:
| File Extension | File Type |
| .ascx | ASP.NET Web User Control file |
| .aspx | ASP.NET Extended file |
| .ashx | ASP.NET Web handler file |
| .asmx | ASP.NET Web Services source file |
| .bat | Batch File |
| .cmd | Windows command script |
| .cpl | Control Panel extension |
| .csh | Script file |
| .dll | Windows dynamic-link library |
| .exe | Executable file |
| .htr | Script file |
| .jar | Java ARchive |
| .lnk | Shortcut |
| .master | ASP.NET master page |
| .msi | Microsoft Windows Installer package |
| .pl | Perl script |
| .ps1 | Windows PowerShell Cmdlet file |
| .ps2 | Windows PowerShell Cmdlet file |
| .psc1 | Windows PowerShell Console file |
| .psc2 | Windows PowerShell Console file |
| .reg | Windows Registry entries |
| .scf | Window Explorer command file |
| .shb | Windows shortcut |
| .soap | Simple Object Access Protocol file |
| .svc | Windows Communication Foundation (WCF) service file |
| .swf | Shockwave Flash Movie file |
| .url | Uniform Resource Locator (Internet shortcut) |
| .vb | Microsoft Visual Basic Scripting Edition (VBScript) file |
| .vbe | VBScript Encoded Script file |
| .vbs | VBScript file |
| .xap | Silverlight Zip file |