File Extension MSF

.MSF File

File extension: MSF
File type: Mail Summary File
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First check your registry for invalid entries.


Notes about the MSF file extension:



Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.

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




Important: Invalid file associations could be the result of underlying issues within your Windows PC. It is highly recommended that you scan your PC for invalid registry entries, unused processes and other slowdown issues.

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: msffile
EXEFile: blank

ProgramID: SQLServer.Replication.Datafile
EXEFile: rundll32 %ProgramFiles%\MICROS~4\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~2\80\COM\replsync.dll,DllAddSubscription -SubscriberDatabasePath %1

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

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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