File Extension MSF

.MSF File

File extension: MSF
File type: Mail Summary File


Notes about the MSF file extension:



To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened" (Windows 7) or "How do you want to open this file?" (Windows 10) if you double-click the file. There click on "More apps" and choose a suitable software to view such files on your PC or from email attachments.

The MSF file type is primarily associated with 'Thunderbird' by Mozilla Corporation.

Thunderbird is the Mozilla mail client. It comes in multiple languages and versions for multiple operating systems (Windows, OS X, Linux).

Each mail folder (Inbox, Sent, etc.) is stored as two files; one with no extension (e.g. INBOX), which is the mail file itself (in ‘mbox’ format), and one with an .MSF extension (e.g. INBOX.MSF), which is the index (Mail Summary File) to the mail file. If importing to another program, tell the other program to import mail from the file with no extension.


Detailed information for file extension MSF:


Primary association: Thunderbird
Company: Mozilla Corporation
Identifying characters Hex: 2F 2F 20 3C 21 2D 2D 20 3C 6D 64 62 3A 6D 6F 72 6B 3A 7A 20 , ASCII: // !-- mdb:mork:z

Other applications associated with file type MSF:

  • EarthLink (E-mail Message File) by EarthLink, Inc.Paired with .MIF file as its index.
  • Multiple Sequence File(biomedical analysis)
  • Netscape Mail (Mail Summary File) by NetscapeEach mail folder (Inbox, Sent, etc.) is stored as two files; one with no extension (e.g. INBOX), which is the mail file itself (in ‘mbox’ format), and one with an .MSF extension (e.g. INBOX.MSF), which is the index (Mail Summary File) to the mail file. If importing to another program, tell the other program to import mail from the file with no extension. The identifying characters used for this association are - Hex: 2F 2F 20 3C 21 2D 2D 20 3C 6D 64 62 3A 6D 6F 72 6B 3A 7A 20 , ASCII: //..!--..mdb:mork:z
File Identifier - TrID
'Identifying characters' used on FILExt.com are
provided by Marco Pontello from his TrID database




To change file associations press Windows Key + X and then Apps and Features > Default apps > Choose default apps by file type. Invalid file associations could be the result of underlying issues within your Windows PC.

Technical data

To view technical data on file-extension MSF click this link to expand/hide the additional area.

System Info for File Extension .MSF

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and information FILExt collected directly from user systems.

ProgramID: Memory Stick Document File

ProgramID: SQLServer.Replication.Datafile
EXEFile: rundll32 %ProgramFiles%\MICROS~3\80\COM\replsync.dll,DllAddSubscription -SubscriberDatabasePath %1

ProgramID: SQLServer.Replication.Datafile
EXEFile: rundll32 %ProgramFiles%\MICROS~2\80\COM\replsync.dll,DllAddSubscription -SubscriberDatabasePath %1

ProgramID: SQLServer.Replication.Datafile
EXEFile: rundll32 %ProgramFiles%\MI6841~1\80\COM\replsync.dll,DllAddSubscription -SubscriberDatabasePath %1

ProgramID: SQLServer.Replication.Datafile
EXEFile: rundll32 %ProgramFiles%\MICROS~4\80\COM\replsync.dll,DllAddSubscription -SubscriberDatabasePath %1

ProgramID: msffile
EXEFile: blank

ProgramID: msffile
EXEFile: %ProgramFiles%\PianitoStudio\PianitoStudio.exe /open %1

ProgramID: msffile
EXEFile: C:\DOCUME~1\Michael\LOCALS~1\Temp\Temporary Directory 2 for pianitostudio[1].zip\PianitoStudio.exe /open %1


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