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Introduction
File Extension
Application Category & Support
Owned by Organization
MIME Type
Registry Keys
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OTM (.OTM) File Extension

The OTM file extension stores macro written for Microsoft Outlook email client application. All Outlook macros are kept in a single VbaProject.otm file that contains scripted programs created in the Visual Basic Editor. These functions are used for scanning email messages or collecting file attachments.

The file extension is *.otm.

Project Files

Microsoft Office Outlook

Microsoft Corporation

Application/octet-stream

Outlook 2007 on Windows Vista/Windows 7

Drive:\Users\(user)\AppData\Roaming\Microsoft\Outlook\VbaProject.OTM

Outlook 2010 on Windows Vista/Windows 7

Drive:\Users\(user)\AppData\Roaming\Microsoft\Outlook\VbaProject.OTM

Outlook 2013 on Windows 8

Drive:\Users\(user)\AppData\Roaming\Microsoft\Outlook\VbaProject.OTM

HKEY_CLASSES_ROOT\.otm

HKEY_CLASSES_ROOT\OTMFile

HKEY_CLASSES_ROOT\Outlook.File.otm.14

HKEY_CLASSES_ROOT\Outlook.File.otm.15

  • Corrupted or damaged OTM file.
  • Incorrect entries of file in the Windows Registry.
  • Accidental deletion of entries containing OTM files details in registry.
  • The supported program is not installed properly.
  • Insufficient resources to open & view OTM file.