Sumatra PDF is a PDF, ePub, MOBI, CHM, XPS, DjVu, CBZ, CBR reader for Windows

Sumatra PDF won't open additional files with double click on PDF files

I am using Sumatra PDF V-3.2 in Windows 10.

It happens frequently that if I have some files open (even just one) in Sumatra PDF, and I click on another PDF file in my file explorer (the standard double click), it doesn’t open, nothing happens. In order to open an additional file, I have to open file explorer from inside Sumatra app (using CTRL+O, which opens the file explorer) and select the files to open.

This doesn’t happen always, but now and then.

This issue wasn’t there before in earlier versions I used. I have been using this software since last 5 years, it worked pretty well before.

Sumatra is my only/default external PDF reader in my PC.

If your on Windows 10 as most users are, then it is not uncommon to have file association problems since MS defauled PDF as a native Edge file, It is still that way on my PC since I cant be bothered to keep reseting it except for some testing. I personally use shortcuts ( that can also fail to work since MS insist each one needs to be controlled) I dont have any of those issues on either Windows 7 systems.

Having said that, once the default is sucessfully set to SumatraPDF, it should always work, unless there is some older historic non working association available that windows in its wisdom, uses by preference.
Since you have updated it seems that windows may be trying to send the pdf to an older registry entry. I hesitate to suggest using a registry cleaner since that has the potential to make matters worse. If you have some knowledge of registry entries it is worth doing a simple search for “SumatraPDF” and see if there are any rogue old .exe entries in old paths that you can correct manually, rather than letting a cleaner loose on all the full range of problems a registry can have. I will occasionally clean out those I find after testing different versions since I dont want windows to attempt to use them over any other version.

Doesn’t sound like an association problem since double-clicking files works at times and fails on other occasions. How are you launching Sumatra? Make sure you’re not running it elevated i.e. as admin, or else double-clicking PDFs in a non-elevated copy of Explorer will result in behavior just as you’ve described.

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