IT and Library Services

Attachments: file types you may encounter

When people send you files via email it is sometimes difficult to tell which application to run to open the file. In most cases Windows will know how to open the file automatically. To determine the application to use, Windows uses the letters or numbers at the end of a file name after the period.  For example, "doc" in a file called "fred.doc".

The following is a guide to some of the file types that you may encounter. It may assist you if you having a problem opening a particular file.


File nameOpens with
doc or docxMicrosoft Word
xls or xlsxMicrosoft Excel
mdbMicrosoft Access
ppt, pptx, pps or ppsxMicrosoft Powerpoint
bmp, jpg, jpeg, gif or tifMicrosoft Paint or equivalent graphics package
avi, mpg, mov, wmv or mp4Media Player or equivalent video package
mp3, wav or aacMedia Player or equivalent audio package
pdfAdobe Acrobat Reader
zipWindows Explorer or Power Archiver