pdf extension), and how the handler is set and then used.įTAs are a bit murky, but this is (to the best of my ability!) how I can ascertain that they behave. The following diagram shows the order of progression when a user is logging on and checking for FTA data (in this case for the. The system will look for user-defined FTAs in HKCU first, if this fails, it will check HKLM for default settings, and if this also fails, it will check HKCU for default settings. When a user logs on to a system, the various Registry keys are queried that deal with FTAs and the associations are set.
So you can call a printing function from the Print command, an editing function from the Edit command, etc. By specifying a filetype/ProgId, you can then move on to the Registry data associated with the filetype and from there extend into handling different user-defined actions via different handlers. Why do we have a filetype (also known as a ProgId)? Well, if you associated an extension directly with a handler, you’d only ever be able to deal with files with that extension via that handler. xml extension in Notepad instead of the default of IE), you can right-click on the file and choose Open With.įTAs have a relationship between the extension, the filetype and the handler. If you wanted to open the file type in a different program (for instance, open a file with the. Each user normally has a set of FTAs stored in their Registry, defining the program that will be used when you double-click a particular file type. txt extension commonly open in Notepad, but you can use many other things, WordPad, Notepad++, even Microsoft Excel. docx extension commonly open in Microsoft Word. We’re all familiar with FTAs – they are the program that opens a particular file type extension.
#HOW TO SET DEFAULT PROGRAM TO OPEN PDF FILE IN WINDOWS 10 HOW TO#
So we are going to write up everything on this topic and finally set up some testing that will show, once and for all, how to deal with them. Judging by the number of emails and comments I get about the subject, it’s clear that it hasn’t been satisfactorily resolved. I have done a number of articles on handling File Type Associations (from hereon in referred to as FTAs) on Windows versions from 8 upwards. FTAs have been a problem for a long time.
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