What is STM File Extension

File Extension is group of letters that specify the data type and helps windows to select the appropriate program to open the particular file. STM file is stand for Streaming Media File used by Exchange Server to store the attachments. STM file is of two type private (priv1.stm) and public (pub1.stm).

What is .stm Extension?

Microsoft Exchange Server is a mail server, contact manager, and calendaring software that enable users to send or receive emails and stores entire communicational data in the .edb file and .stm file. The .stm extension file contains all attachments. In Exchange 2003 and its earlier versions stores the attachments in separate file called .stm file.

        Format :- .stm File Format
        Category :- Data File
        Mime Type :- application/octet-stream
        Application :- Microsoft Exchange Server

The .stm extension file is of two type priv1.stm and pub1.stm. The private stm file contains all privately exchange attachments and public stm file contains all attachments which is shared in a group or publically. The Microsoft Exchange Server stores .edb file and .stm file at same place but you can change the location of this file as your requirement. After exchange 2003 the attachments are also stored in the .edb file that replaces the role of .stm extension file.

Location of .stm File

Exchange Server 2003 and all its previous version stores stm file separately and its specified path is given below.
C:\Program Files\Exchsrvr\MDBDATA\Priv1.stm
C:\Program Files\Exchsrvr\MDBDATA\Pub1.stm

How to open .STM File Format

Open a .stm file format is as simple as a word or text file, just double click on the stm file and file will be open. If you are not able to open by double click then the STM file must have some issue. I am listing all possible issues that make a .stm file inaccessible.

Issues of Exchange .stm file

If you are not able to access the .stm file then file have some problem I am listing here some common problems.

STM file is corrupted.

The registry entry contains incorrect link to the .stm File.

Incomplete installation of .stm file supported applications.

Accidently deletion of .stm file description from the windows registry.

The computer does not have enough hardware resource.

Programs that open .STM File Format

Microsoft Exchange Server

Outlook Microsoft Exchange Server Mail Client.

SysTools Exchange Recovery Software.

Registry Key For .STM File

HKEY_CLASSES_ROOT\.stm
HKEY_CLASSES_ROOT\
HKEY_CLASSES_ROOT\FantasyDVD Multimedia File
HKEY_CLASSES_ROOT\htmlfile
HKEY_CLASSES_ROOT\ModPlugPlayer
HKEY_CLASSES_ROOT\OpenMPTFile
HKEY_CLASSES_ROOT\PowderToySave
HKEY_CLASSES_ROOT\stmfile
HKEY_CLASSES_ROOT\stmlfile
HKEY_CLASSES_ROOT\Winamp.File
HKEY_CLASSES_ROOT\Winamp.File.stm

Conclusion
I have tried to put all the information related to .stm file extension here and I am sure that this effort will help you, if you have any additional information then feel free to contact us.