An smtmp file extension might be found on folders generated by some malicious viruses on users computer. 

Detailed description

Software that open smtmp file

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SMTMP file extension - Trojan:Win32/FakeSysdef folder

What is smtmp file? How to open smtmp files?

File type specification:

Dangerous and malicious file type icon Dangerous and malicious file type

The smtmp is not actually file extension, but a folder created by malicious Ttrojans known as Trojan:Win32/FakeSysde by Microsoft, or Trojan.Win32.FraudPack.csve (Kaspersky), Troj/FakeAV-DOF (Sophos) as well as TROJ_FAKEAV.ORT by Trend Micro.

This very annoying Trojan virus creates the SMTMP folder in C:\Users\%User\AppData\Local\Temp\ folder and moves to it all files from Start and Desktop folders, basically screwing up users Start Menu and Desktop.

It also modifies the moved files with hidden tag, so they are no longer visible to common users (with hidden files hidden in system).

In most cases it also adds itself in executable form to be run at every startup. Might also display fake warnings and security scans and tries to scams users to purchase a rogue Antivirus product and to share their confidential information such as credit card number.

The default software associated to open smtmp file:

Avast Antivirus icon

AVAST Software a.s. logoAvast Antivirus  Microsoft Windows software

Company or developer:
AVAST Software a.s.

Avast antivirus is one of the most used antivirus programs with over 220 mil. users. The Essential version is available for free and can be upgraded to All-inclusive or Top-notch editions.

The program is available mainly for Windows, but there is also version for Mac, Linux and main mobile OS platforms for Android phones and Apple iPhones/iPads.

Help how to open:

If you see folder like this in your computer, you should definilty check your system for viruses with any reliable antivirus software, such as Avast, or AVG.

How to convert:

Probably cannot be converted to other formats.

Related links:

How to restore Start Menu

List of recommended software applications associated to the .smtmp file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open smtmp file, edit smtmp file, convert smtmp file, view smtmp file, play smtmp file etc. (if exist software for corresponding action in's database).

Unspecified and all other actions for computer programs working with smtmp file - Trojan:Win32/FakeSysdef folder

Click on the software link for more information about Avast Antivirus. Avast Antivirus uses smtmp file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).

Microsoft Windows:

Main software associated with smtmp file by default:
Avast Antivirus small icon Avast Antivirus
Other suggested software:
AVG Antivirus small icon AVG Antivirus

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