SumatraPDF Not Showing in Open With: How to Fix It

If SumatraPDF is installed but missing from Windows Open With or Default Apps, the problem is usually not the PDF itself. Windows may not have registered the installed application correctly, the portable edition may never have been registered, or Windows may be displaying a stale list of available apps. The fastest solution is often to browse directly to SumatraPDF.exe. If that does not work, the steps below will help you distinguish an app-registration problem from a file-association, installation, permissions, or document-format issue.

1. Confirm the Symptom With One PDF Test

Start with one ordinary, locally saved .pdf file. A single-file test prevents unrelated problems, such as an unsupported document type, a damaged download, or restricted access to a network folder, from confusing the diagnosis.

1. Save or copy a known-working PDF to your Desktop or Documents folder.
2. Right-click the file.
3. Select Open with, followed by Choose another app if that option appears.
4. Look for SumatraPDF in both the initial list and any expanded app list.

If SumatraPDF appears and opens the test PDF, the program is working. Select it and enable the option to always use it for PDF files if you want it to become the default. Stop troubleshooting once the file opens correctly and Windows retains your selection.

If SumatraPDF is absent, confirm that it can still be launched from the Start menu or directly from its executable. Open SumatraPDF first, and then use File and Open to load the same PDF. If this works, SumatraPDF itself is operational and the missing Open With entry is primarily a Windows registration or association problem.

If the program launches but the test file does not open, try a second known-good PDF. A failure limited to one document points toward that file, its permissions, or its contents rather than the Open With registration.

2. Find and Select SumatraPDF.exe Manually

Windows lets you associate a file type with an executable even when the application is missing from its suggested list. This is the most direct fix for SumatraPDF not showing in Open With.

2.1 Browse to the executable from Open With

1. Right-click the test PDF and choose Open with.
2. Select Choose another app.
3. Choose More apps if Windows displays that option.
4. Select Look for another app on this PC or the equivalent browse option.
5. Navigate to SumatraPDF.exe, select it, and click Open.

On some Windows 11 builds, the wording and layout differ slightly. You may need to select Choose an app on your PC. The goal is the same: browse to the actual executable instead of waiting for Windows to suggest it.

Success means the PDF opens in SumatraPDF and SumatraPDF subsequently appears as a choice for PDF files. If you selected the always-use option, double-clicking another PDF should also open it in SumatraPDF. Once both tests succeed, no further repair is necessary.

2.2 Check common installed locations

The exact path depends on the SumatraPDF build and the choices made during installation. Common locations include:

• C:\Program Files\SumatraPDF\SumatraPDF.exe for many 64-bit installations.
• C:\Program Files (x86)\SumatraPDF\SumatraPDF.exe for a 32-bit installation on 64-bit Windows.
• A user-selected folder if a custom installation location was used.
• The folder where you extracted or saved the portable executable.

ARM64 Windows systems can run ARM64 and, depending on the system configuration, compatible x64 or x86 applications. Do not identify the correct executable solely by assuming that an ARM64 build must use a uniquely named folder. Search the normal Program Files locations, the Start menu shortcut target, and the folder from which the program is currently launched.

To find the path from a working Start menu shortcut, search for SumatraPDF, right-click the result, and use Open file location when available. Open the shortcut's properties and inspect its Target. You can also search File Explorer for SumatraPDF.exe, although searching the entire computer may take time.

2.3 Avoid selecting a shortcut or installer

Windows needs the reader executable, not the setup package, a ZIP archive, or a Start menu shortcut. Select the file named SumatraPDF.exe. A downloaded installer may have a longer filename containing a version or architecture label, but registering that installer as the PDF opener is not the intended fix.

3. Check Installed Versus Portable Mode and Windows Registration

The installed and portable editions can run similarly, but Windows integration is different. An installer can register application information and file-handling capabilities with Windows. A portable executable is designed to run from its current folder and may not automatically appear in every Windows app-selection interface.

3.1 If you use the portable edition

Place the portable executable in a stable folder before associating files with it. Do not leave it in a temporary extraction directory, inside a ZIP archive, or on a removable drive that is not always connected.

A practical location might be a dedicated applications folder within your user profile. After moving the executable to its permanent location, repeat the manual Open With browsing process. Moving it again later can break the association because Windows will continue looking at the old path.

Success means Windows opens the test PDF through the portable executable at its permanent location. The program does not necessarily need to appear in every part of the Default Apps interface for the direct file association to work.

3.2 If you use the installed edition

If an installed copy is missing from both Open With and Default Apps, its Windows registration may be incomplete or stale. This can happen after the program folder was moved manually, an installation was interrupted, a cleanup utility removed registration data, or an older copy was deleted without a normal uninstall.

First, try browsing to the installed executable manually. If that works, you can stop unless you specifically need SumatraPDF to be discoverable throughout the Default Apps interface. If Windows refuses to retain the choice or the executable no longer exists at the shortcut's target, reinstalling is the cleaner repair.

3.3 Refresh the Windows Default Apps list

Windows Settings does not always refresh its app lists immediately. Close Settings and any open Open With dialogs after selecting the executable manually. Then reopen Settings, go to Apps and Default apps, and search for either SumatraPDF or the .pdf extension.

If SumatraPDF appears, assign it to .pdf and any other format you intentionally want it to handle. SumatraPDF supports more than PDFs, but there is no need to associate every supported format. Choose associations according to your workflow.

If it does not appear by application name, search for .pdf and choose the current default for that extension. The extension-based selector may offer different choices from the app-name search. Restarting Windows can refresh cached shell information, but do this after browsing manually or repairing the installation rather than using a restart as the only troubleshooting step.

4. Rule Out Format, File, and Access Problems

The Open With list is influenced by the selected file's extension. Testing a PDF is important because an app may be offered for one format but not another. SumatraPDF can read several document and image formats, but Windows associations are maintained separately for extensions such as .pdf, .epub, .mobi, .chm, .djvu, .xps, and comic-book archives.

4.1 Verify the real file extension

Enable File name extensions in File Explorer's View options. Confirm that the test document really ends in .pdf. A file named to resemble a PDF may actually be an HTML download, archive, shortcut, or incomplete browser download.

If SumatraPDF appears for a PDF but not for another format, registration for the other extension is the issue. Browse to SumatraPDF.exe while using a file with that specific extension, provided the format is one SumatraPDF supports.

4.2 Move the test file to a local folder

Copy the document to Desktop or Documents and test it there. Files on network shares, synchronized folders, removable drives, email attachments, or protected system locations can introduce access restrictions unrelated to app registration.

Also check the file's Properties dialog. If Windows shows an Unblock option for a trusted file obtained from another computer, you may choose it after confirming the source is safe. Do not alter document protections, bypass access controls, or attempt to remove DRM. If the document legitimately requires credentials or authorized software, use the access method supplied by its publisher or administrator.

4.3 Separate opening problems from rendering and printing problems

Codecs, Ghostscript, printer drivers, and external tools are generally not responsible for SumatraPDF being absent from Open With. They become relevant only after Windows successfully launches the reader and a particular operation fails.

• If SumatraPDF is missing from the app list, focus on the executable path and Windows registration.
• If SumatraPDF opens but a particular file fails, test the file and format.
• If the document displays but printing fails, test another printer, the Microsoft Print to PDF destination, and the printer driver.
• If a specialized document workflow depends on an external converter or interpreter, troubleshoot that tool only after confirming that normal PDFs open.

This separation prevents unnecessary changes to graphics components or printer software when the actual symptom is simply a missing application entry.

5. Inspect SumatraPDF-settings.txt Safely

SumatraPDF stores preferences in a file commonly named SumatraPDF-settings.txt. Those preferences can affect the reader's behavior, but they normally do not create the core Windows Open With registration. Therefore, deleting the settings file should not be the first fix for a missing app-list entry.

Settings inspection is relevant when SumatraPDF launches but behaves unexpectedly, fails to preserve an internal preference, or a clean portable test works while the usual copy does not. Before changing anything, exit every SumatraPDF window so the program does not overwrite your edits or backup during shutdown.

1. Locate SumatraPDF-settings.txt in the application's data location or beside a portable copy, depending on how that copy is configured.
2. Copy the file to a safe backup location.
3. Rename the original to something recognizable, such as SumatraPDF-settings-backup.txt.
4. Launch SumatraPDF and let it create or use clean settings.
5. Test the single local PDF again.

If the clean settings resolve an in-app behavior problem, reapply only the preferences you need instead of restoring an entire potentially problematic configuration. If nothing changes, close SumatraPDF and restore the backup. For a reader that is merely missing from Open With, return your attention to Windows association and installation repair.

6. Run a Clean Temporary Test Before Reinstalling

A clean test can show whether the installed program is damaged without immediately removing settings or changing many associations. Download a current official portable build or installer from the SumatraPDF website. Keep the test copy separate from the existing installation.

1. Close the installed SumatraPDF copy.
2. Save or extract the clean test copy into a new temporary folder.
3. Launch its SumatraPDF.exe directly.
4. Open the known-good local PDF from inside the program.
5. Use Open With and browse manually to this test executable.

If the clean executable opens the PDF and can be selected through Open With, Windows can launch SumatraPDF correctly. The original executable path, installation, or shortcut is likely the problem. Do not keep a permanent association pointed at a temporary folder. Either move the portable copy to a stable location and associate it again, or repair the installed edition.

If neither copy opens the test PDF, verify that the file opens in another trusted PDF reader and check security software or organizational restrictions. On a managed work computer, policy may limit which applications can be selected. Contact the administrator rather than attempting to work around those controls.

7. Reinstall SumatraPDF When Registration Is Broken

Reinstallation is appropriate when the installed executable is missing, the Start menu shortcut points to an invalid location, manual selection fails to persist, or SumatraPDF remains absent from Windows Default Apps after a refresh.

1. Download the appropriate installer from the official SumatraPDF website.
2. Close SumatraPDF and save a backup of any settings you intentionally customized.
3. Run the installer using the normal account and security process for your computer.
4. Install to the default location unless you have a specific reason to choose another folder.
5. After installation, open SumatraPDF once.
6. Right-click the test PDF and check Open With again.

Choose the build appropriate for your Windows hardware and operating system, such as 64-bit, 32-bit, or ARM64 when offered. Most modern Intel and AMD Windows computers use 64-bit Windows, while ARM-based devices use ARM64 Windows. If you are unsure, check Settings, System, About, and the System type field.

Success means SumatraPDF appears in Open With or can be selected by browsing, opens the test PDF, and remains available after the dialog is closed and reopened. Stop changing settings at that point. Repeated reinstalls, registry cleaners, and manual registry edits are unnecessary when the association is already working.

8. Quick Fix Checklist

• Test with one known-good .pdf saved in a local user folder.
• Confirm SumatraPDF launches independently and opens that PDF through its File menu.
• Use Open With and browse directly to SumatraPDF.exe.
• Check Program Files, Program Files (x86), the shortcut target, or the portable folder.
• Move a portable copy to a permanent folder before creating an association.
• Close and reopen Windows Settings to refresh Default Apps.
• Search Default Apps by both SumatraPDF and the .pdf extension.
• Confirm the document's actual extension and test outside network or protected folders.
• Do not reset SumatraPDF-settings.txt unless an in-app settings problem is also present.
• Run a clean portable test to separate installation damage from Windows behavior.
• Reinstall from the official installer if application registration is broken.
• Stop once SumatraPDF opens the test PDF and Windows retains the selection.

9. Frequently Asked Questions

9.1 Why is SumatraPDF installed but missing from Open With?

Windows may not have a valid registration entry for the program, its executable may have moved, or the app-selection list may be stale. Portable applications may also be absent because they were not installed and registered in the conventional way. Browsing directly to SumatraPDF.exe is usually the best first fix.

9.2 Can I add portable SumatraPDF to Open With?

Yes. Put the portable executable in a permanent folder, right-click a PDF, choose Open With, and browse to that executable. Do not move or delete it afterward. If its path changes, repeat the association using the new location.

9.3 Which SumatraPDF.exe should I select?

Select the executable that launches the copy you intend to keep using. For an installed edition, it is commonly under C:\Program Files\SumatraPDF or C:\Program Files (x86)\SumatraPDF. For a portable edition, select the executable in its permanent folder. Do not select the installer.

9.4 Should I delete SumatraPDF-settings.txt?

Not for this symptom alone. The settings file controls SumatraPDF preferences, while Open With availability is mainly handled by Windows application registration and file associations. Back up and reset the settings file only when the program itself has a settings-related problem or a clean test indicates that its configuration may be involved.

9.5 Why does SumatraPDF appear for PDFs but not another supported format?

Windows tracks associations separately by file extension. An association for .pdf does not automatically create one for EPUB, DjVu, XPS, CHM, comic archives, or image formats. Right-click a file of the affected type and browse to SumatraPDF.exe, but first confirm that SumatraPDF supports that format.

9.6 When should I reinstall SumatraPDF?

Reinstall when the executable is missing, shortcuts are broken, the installed program cannot be selected manually, or Windows does not recognize it after the Default Apps interface is refreshed. Use the official installer. If manual selection works and remains available, reinstalling is optional rather than necessary.