How can I create a simple file that changes the association of PDF in Windows like the following?

run file1 → change PDF to Sumatra PDF Reader
run file2 → change PDF to FoxIt Phantom

Is there a simple solutions?

up vote 1 down vote accepted

First, get the result of this command:

assoc .pdf

It gives the current association between .pdf and its document type. In my case, the output is:


Based on this output, I created two .bat files:

ftype FoxitPhantomPDF.Document="C:\Program Files\SumatraPDF\SumatraPDF.exe" "%1"


ftype FoxitPhantomPDF.Document="C:\Program Files (x86)\Foxit Software\Foxit PhantomPDF\FoxitPhantomPDF.exe" "%1"

You have to run the .bat files as an admin.

Sorry, but there is a problem there:

  • when I open an administrator prompt in Windows and type the above commands they work fine (!), but when I right click on the bat files and run them as administrator they don't work!
  • Dang. Beat me to it by 10 seconds. ;-) Thanks for asking. I learned something new as a result. – Steve Rindsberg Jan 21 '17 at 22:23
  • I'm guessing that after you associate FoxitPhantomPDF.Document with SumatraPDF, PDF becomes some other type, e.g. SumatraPDF.Document, so to toggle back, you'd have to FTYPE SumatraPDF.Document= ... FoxitPhantomPDF.Exe etc. – Steve Rindsberg Jan 22 '17 at 16:36
  • that is not the case – acman123 Jan 22 '17 at 17:58
  • But I got the output ".txt=txtfile" for "assoc .txt" (Windows 10). I have UltraEdit (v. 16.2) associated with .txt files. How do you explain that? – Peter Mortensen Jul 16 at 18:58

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