The SGL file extension is a Master Document from the StarWriter 5 versions. It was the native format for this application. It can now be opened by Apache OpenOffice Writer.


The MHTML file is an archived web page document, created by Internet Explorer of the Microsoft Corporation. This file type has been found to be infected in the past and should carefully be scanned by an antivirus software application when a file of this type is sent to you.

Mime type: message/rfc822


The DIF file format, short for Data Interchange Format, is used to export or import single spreadsheets between spreadsheet software such as Excel, OpenOffice and Gnumeric. The limitation of a DIF file is that it cannot handle multiple spreadsheets in a single workbook.


A LOG file is an ASCII text file that is used by the system or other software applications to store important data. It may not be opened, moved or deleted when in use, since it can affect the behaviour of system utilities. Often data derived from virusscanners are stored in LOG files.


The OpenDocument Global Text Document extension, or ODM extenstion, is a document file that has become a part of the OpenDocument format for Office Applications and has been expected to become an industry standard. Although OpenOffice has adopted that extension, other software suites may also produce this extension in its formats.

Mime type: application/vnd.oasis.opendocument.textmaster, application/x-vnd.oasis.opendocument.textmaster


The POTX file extension is used for the new and upcoming PowerPoint presenation formats by the Microsoft Corporation. Similar to POTM, it combines a XML architecture with a ZIP compression and remains and open format for anyone to use and can be opened by older version of Microsoft Office.

Mime type: application/vnd.openxmlformats-officedocument.presentationml.template


The SDC file type is a spreadsheet used by Apache OpenOffice Spreadsheet. This is an application that is similar to Microsoft Excel. It contains cells with data that can be converted into different file formats such as PDF, XLS ( for Excel) and CSV.


The TXT file format is a document that contains text. It can be opened in any text editor. An original TXT file will consist of pure ASCII text without formatting. The Macintosh variant of TXT is TEXT.

Mime type: text/plain, application/txt, browser/internal, text/anytext, widetext/plain, widetext/paragraph


XLS is the primary format for Microsoft Excel. It is the default for saving¬†spreadsheets which hold data like charts and macros. Warning: because of it’s popularity .xls is a file which is often infected when send by people you don’t know. Do not open these files without scanning them first.

Mime type: application/ [official], application/msexcel, application/x-msexcel, application/x-ms-excel, application/, application/x-excel, application/x-dos_ms_excel, application/xls


The DJVU extension is the extension given by the DjVu software by LizardTech. DjVu compresses images in order to distribute images of very high resolution of scanned documents, digital documents and photographcs on the internet. DjVuLibre is an open source implementation of DjVu. WinDjView is a Windows based application in order to view and print DjVu documents.

Mime type: image/vnd.djvu