File Extension Library


.OAS File Extension

  • Developer by: rsbr Software
  • Category: Email related data Files

What are .OAS files and how to open them?

Can't open .OAS file? Are you wondering what it contains? On our site we will explain to you what this file is, what it is used for and what software opens the .OAS file.

What is a .OAS file extension?

.OAS file extension is created by rsbr Software. .OAS has been classified as Email related data Files.

.OAS is Microsoft Outlook Attachment Sniffer data

The oas file extension is used for add-ins for Microsoft Outlook, a personal information manager, which is part of Microsoft Office, developed by Microsoft Corporation.

The oas files are plug-ins created by Outlook Attachment Sniffer utility. Outlook attachment sniffer is a little utility that removes attachment from Outlook's emails and replaces them by a link to as oas file.

For example a file attached to an email with the name MYFILE.XLS would be removed from the email and replaced by a link called MYFILE.OAS. The original attachment is then saved in an external folder.


How to open:

Double click on *.oas file in the Outlook message.

How to convert:

Conversion to other formats is not possible.

How to fix problems with .OAS files

  1. You need to update the application that you normally use to open .OAS files. Only the latest version of the software supports the current .OAS file format
  2. You need to check the .OAS file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)