Associating File Types
Often many users see the message "Windows cannot open file, needs to know which program
created it" when trying to open an e-mail attachment. You can also get the message... "this
file does not have a program associated with it for performing this action create program
in control panel ...options"... what do does on look for? As well as mail attachments giving
problems, it is possible that you have un-installed a trial version and now when double-clicking
on a file you obtain the same message. So do you solve problems such as these?
Both error messages are because someone has sent you a type of file that your software
does not recognise. To find out what program is needed you must look at the file
extension, which are the last three characters of the file name after the dot.
Most likely this will not be shown in the default Windows installation so in order to
see that extension type in Windows Explorer, you must click on Tools, Folder options and
remove the tick from "Hide extensions for known file types"
The actual association is performed from Windows and the actual wording on the
dialogues boxes will vary a bit depending on version of Windows. So to finally associate
or to re-associate a file type, perform the following steps:
1. Highlight the wanted file with a mouse left click
2. Right click on the selected file
3. Select Open With then select Choose a Program
4. Select the required program from the list and check the "Always open with this program"
To identify what program is associated with what file extension, you should visit one
of the many Internet sites providing this information. One such site is
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