phonebook_object.dll Errors: Restore the Sony Ericsson Software

“phonebook_object.dll was not found,” “The program can’t start because phonebook_object.dll is missing,” and “Error loading phonebook_object.dll” are common forms of this legacy application error.

The 60-second answer is to identify the Sony Ericsson program named in the error, startup entry, or shortcut, then repair or reinstall that complete application from its original installer or trusted archival media. Do not download the DLL separately or copy it into System32 and SysWOW64.

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What phonebook_object.dll is

phonebook_object.dll is an obscure 32-bit Windows application DLL associated with the old Sony Ericsson phone-management software ecosystem. Public file metadata describes it as “phonebook_object Module,” developed by Sony Ericsson Mobile Communications AB, with copyright attributed to Teleca Software Solutions AB.

Metadata reports commonly identify the file as a Win32/x86 DLL of approximately 180 KB, with a reported build of 1.0.0.1099. Those details are useful identification clues, but they come from DLL metadata records rather than a current Sony Ericsson file manifest. A legitimate copy may not have exactly the same size, version information, or hashes.

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The most likely parent program is an old Sony Ericsson PC Suite installation or a closely related synchronisation component. Sony Ericsson PC Suite software was designed to manage phone contacts, calendars, notes, backups, and synchronisation. The filename’s phonebook-related name fits that role.

It is not identified as:

• A Windows system component
• A Microsoft runtime
• A DirectX file
• A standard Visual C++ redistributable
• A device driver
• A DLL that normally belongs in C:WindowsSystem32
• A DLL that normally belongs in C:WindowsSysWOW64

The exact Sony Ericsson installer package that placed this particular file is not conclusively documented by a current official manifest. Treat PC Suite as the most likely source, not as a proven match for every historical copy.

What the error actually means

“phonebook_object.dll was not found”

The application cannot find the DLL in the location expected by its executable. This can happen when:

• The DLL was deleted
• The application installation is incomplete
• The program was moved to another folder
• An uninstall removed part of the software
• Antivirus software quarantined the file
• A shortcut or startup entry points to an old installation

“The specified module could not be found”

This message does not always mean that phonebook_object.dll itself is absent. Windows may have found the named DLL but failed to load one of its required dependencies.

Other possible causes include:

• A damaged DLL
• A missing dependency
• A 32-bit and 64-bit architecture mismatch
• A blocked or quarantined file
• An incorrect application path
• An incompatible legacy application

“Cannot register phonebook_object.dll”

This wording does not prove that the DLL should be registered. Many DLLs are private application libraries and do not use COM registration. Running regsvr32 against an ordinary application DLL can produce a missing-entry-point or architecture error without repairing anything.

Fix 1: Repair the Sony Ericsson program

This is the safest first repair when you still need the phone software.

Windows 11

1. Select Start.
2. Open Settings.
3. Select Apps.
4. Select Installed apps.
5. Search for Sony Ericsson PC Suite or the program named in the error.
6. Select the three-dot menu beside it.
7. Choose Advanced options if available.
8. Select Repair.

Not every classic desktop installer provides an Advanced options or Repair button. If you do not see one, use Control Panel instead.

Windows 10

1. Select Start.
2. Open Settings.
3. Select Apps.
4. Select Apps & features.
5. Select the Sony Ericsson program.
6. Choose Advanced options, if shown.
7. Select Repair.

Classic desktop repair

1. Press Windows key and type Control Panel.
2. Open Control Panel.
3. Select Programs.
4. Select Programs and Features.
5. Locate the Sony Ericsson PC Suite or related entry.
6. Right-click it.
7. Select Repair or Change.
8. Follow the installer prompts.

Microsoft documents these application-repair paths in its guide to repairing apps and programs in Windows.

Restart Windows after the repair and launch the original program from its normal shortcut. If it starts without the DLL message, the installation has been repaired. If the same message returns, continue with a complete reinstall rather than replacing only the DLL.

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Fix 2: Reinstall the complete Sony Ericsson package

Use this step when Repair is unavailable or unsuccessful.

Before uninstalling, preserve any phone backups, exported contacts, or synchronised data that still exists on the computer. If the application is needed to recover old phone data, copy those backups to separate storage first.

1. Open Settings.
2. Select Apps.
3. Open Installed apps on Windows 11, or Apps & features on Windows 10.
4. Select the Sony Ericsson application.
5. Choose Uninstall.
6. Complete the uninstall wizard.
7. Restart the computer.
8. Run the original PC Suite installer from your trusted archival media or organization’s software archive.
9. Right-click the installer and select Run as administrator.
10. Install the complete package, including its phone synchronisation components.
11. Restart Windows again.
12. Test the application before reconnecting the phone.

If the program is listed only in Control Panel, open Control Panel > Programs > Programs and Features, select it, and choose Uninstall or Change.

Use the installer that belongs to the phone software you actually need. Do not combine a DLL from one Sony Ericsson package with the executable from another. Legacy PC Suite releases may have compatibility limitations on current Windows versions, and successful installation does not guarantee full phone connectivity.

If the installer refuses to run:

1. Right-click the installer.
2. Select Properties.
3. Open the Compatibility tab.
4. Select Run this program in compatibility mode for.
5. Try an older Windows version offered by the compatibility dialog.
6. Select Run this program as an administrator.
7. Select Apply, then OK.
8. Run the installer again.

You can also open Settings > System > Troubleshoot > Other troubleshooters and check whether a Program Compatibility Troubleshooter is available. The exact troubleshooting options vary by Windows release.

Fix 3: Check whether antivirus software quarantined the file

If the error began after a scan, cleanup operation, or security alert, check quarantine before reinstalling anything.

1. Open Windows Security from the Start menu.
2. Select Virus & threat protection.
3. Select Protection history.
4. Review recent detections.
5. Look for an entry associated with the Sony Ericsson installation directory or phonebook_object.dll.

Do not restore the file solely because its name looks familiar. A counterfeit DLL can use the correct filename. Restore or allow it only when:

• It came from the original Sony Ericsson installation
• The application is still required
• The detection is understood
• The file’s location matches the application directory
• Your security software does not continue to identify it as malicious

Microsoft explains this process in its guide to Protection history in Windows Security.

If the file is repeatedly quarantined, do not disable antivirus protection to force the program to run. Remove the old installation and reinstall it from a known, trusted source. If the detection remains, leave the file quarantined and investigate the application separately.

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Fix 4: Check the application directory and architecture

A private DLL is usually loaded from the program’s own directory or another location specified by the application. Microsoft describes the normal DLL search order and application-local DLL behavior in its DLL redirection documentation.

To inspect the program location:

1. Right-click the shortcut that produces the error.
2. Select Properties.
3. Open the Shortcut tab.
4. Note the path in Target.
5. Select Open File Location, if available.
6. Look for phonebook_object.dll beside the program executable.

If the DLL is absent, reinstall the application. If it is present but the program still reports that it cannot load it, the problem may be a dependency or architecture mismatch.

The reported file is 32-bit Win32/x86. A 32-bit application needs a compatible 32-bit DLL and compatible dependencies. A 64-bit replacement is not a repair. Do not copy the file into both Windows system directories. That can create version conflicts and place an application-specific library where unrelated programs might load it.

Do not change the global PATH variable simply to make this one legacy program find its DLL. Restore the application to its intended installation directory instead.

Fix 5: Check dependencies instead of downloading replacement DLLs

If phonebook_object.dll exists in the correct application directory, Windows may be failing to load a dependency.

A dependency-analysis utility can help identify whether a required library is absent or has the wrong architecture. Use such a utility for diagnosis only. Do not use its results as a reason to download unrelated DLLs from random websites.

The correct repair remains:

1. Record the missing dependency name, if one is reported.
2. Confirm whether the dependency belongs to the Sony Ericsson package.
3. Reinstall the complete application.
4. Install a runtime only if the application’s documentation or installer specifically requires it.

There is no direct evidence that this particular DLL is repaired by installing Visual C++, DirectX, .NET, or Windows Update. Do not begin with generic runtime packages unless a separate error explicitly identifies one.

Fix 6: Repair Windows components only if Windows itself is damaged

Because phonebook_object.dll is associated with third-party Sony Ericsson software rather than Windows, system repair is not the primary fix. Use DISM and SFC when Windows has broader corruption symptoms, including failures in built-in applications or protected system files.

Install pending Windows updates and restart first. Then open an elevated Command Prompt:

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1. Open Start.
2. Type Command Prompt.
3. Right-click Command Prompt.
4. Select Run as administrator.
5. Approve the User Account Control prompt.
6. Run:

DISM.exe /Online /Cleanup-image /Restorehealth

1. Wait for DISM to finish.
2. Then run:

sfc /scannow

1. Restart Windows.
2. Test the Sony Ericsson application again.

Microsoft specifies this order in its guide to using System File Checker. DISM and SFC repair protected Windows components. They do not reinstall a missing third-party Sony Ericsson DLL.

Repeating these commands will not reconstruct an unavailable PC Suite installation. If both commands complete successfully and the error remains, return to repairing or reinstalling the Sony Ericsson program.

Manually hunting through Windows repair results and repeating SFC or DISM without knowing what changed can be time-consuming. Outbyte PC Repair can scan for reported Windows problems and show what it identifies; repair actions are performed by the full version. It is optional, and reinstalling the Sony Ericsson application remains the definitive fix for this file.

If Windows still has wider problems, use the appropriate Windows recovery options rather than trying to obtain this DLL from a download site.

Fix 7: Update or reinstall a related phone driver only when Device Manager identifies one

phonebook_object.dll is an application library, not a device driver. Updating a USB or phone driver is relevant only if the Sony Ericsson software starts but cannot detect the connected phone, or if Device Manager reports a driver problem.

1. Connect the phone, if it is safe to do so.
2. Right-click Start.
3. Select Device Manager.
4. Expand Universal Serial Bus controllers, Portable Devices, Modems, or another category containing the phone.
5. Look for a yellow warning icon.
6. Right-click the affected device.
7. Select Properties.
8. Read the status on the General tab.
9. Open the Driver tab.
10. Select Update Driver.
11. Choose Search automatically for drivers.
12. Restart Windows if prompted.

If the driver is damaged:

1. In Device Manager, right-click the affected device.
2. Select Uninstall device.
3. Confirm only if the device is clearly the obsolete phone component.
4. Restart Windows.
5. Reinstall the driver through the original Sony Ericsson package or a trusted device-specific source.

Do not uninstall unrelated USB controllers to solve a DLL startup message. Device Manager cannot replace phonebook_object.dll.

Finding the correct driver manually can mean hunting through old package versions and guessing which device entry is stale. Outbyte Driver Updater can scan and identify reported driver issues; driver installation is handled by the full version. It is optional, and it will not replace the Sony Ericsson application DLL when the application installation is the real problem.

Do not use regsvr32 unless the vendor requires it

regsvr32 is not a general-purpose DLL installation command. It is intended for DLLs that provide a registration entry point such as DllRegisterServer, commonly used by certain COM or ActiveX components. Microsoft documents its purpose and syntax in the regsvr32 command reference.

There is no verified evidence that phonebook_object.dll requires registration. Do not run:

regsvr32 phonebook_object.dll

as a routine repair.

If the Sony Ericsson installer or vendor documentation specifically tells you to register the file, use the copy in the application’s own directory and match the command to the application architecture. Otherwise, a failed registration message is likely to distract from the real issue.

If the program is no longer needed

If you no longer own or use a Sony Ericsson phone, repairing the DLL may be unnecessary.

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1. Open Settings > Apps > Installed apps on Windows 11, or Settings > Apps > Apps & features on Windows 10.
2. Uninstall Sony Ericsson PC Suite and related Sony Ericsson entries.
3. Restart Windows.
4. Check Task Manager by pressing Ctrl + Shift + Esc.
5. Open the Startup apps tab.
6. Disable any remaining Sony Ericsson startup entry.
7. Check Control Panel > Programs and Features for an additional legacy component.
8. Remove only entries clearly associated with the old phone software.

If a startup error remains after uninstalling, inspect Task Manager > Startup apps and the Start menu’s Startup folder. Do not delete random files from Windows directories. A leftover shortcut or scheduled task may be calling an installation that no longer exists.

If reinstalling still fails

Use this order:

1. Confirm the error names the correct application.
2. Check that the installer matches the intended Sony Ericsson phone software.
3. Run the installer as administrator.
4. Try the Program Compatibility Troubleshooter.
5. Temporarily disconnect the phone during installation.
6. Check the application directory after installation.
7. Review Event Viewer by opening Start and searching for Event Viewer, then selecting Windows Logs > Application.
8. Test the program from a new local Windows account if the failure may be profile-specific.
9. Preserve old phone backups before further removal attempts.
10. Consider an isolated legacy Windows environment if the software is incompatible with the current system.

Possible remaining causes include an unavailable legacy installer, an undocumented dependency, incompatibility between the old application and current Windows, an incompatible 16-bit or 32-bit component, or a damaged user profile.

FAQ

Is phonebook_object.dll a genuine file?

It has a coherent Sony Ericsson and Teleca product association and a phonebook-related module name. That supports it being a genuine legacy application component. The filename alone does not prove that a particular downloaded copy is authentic or safe.

Does Windows need phonebook_object.dll?

No evidence identifies it as a Windows component. Windows does not normally require this file to be present in System32 or SysWOW64.

Which program installed it?

The most likely source is Sony Ericsson PC Suite or a related Sony Ericsson phone synchronisation component. The exact package and installer version are not verified.

Should I download phonebook_object.dll separately?

Generally no. A standalone DLL may contain malware, the wrong version, or the wrong architecture, and it does not restore missing dependencies or application settings. Reinstall the complete original program instead.

Is it a 32-bit or 64-bit DLL?

Public metadata reports a 32-bit Win32 file. No verified 64-bit build has been established. A 32-bit application needs the compatible 32-bit component.

Why does Windows say the specified module could not be found when the file is present?

The named DLL may depend on another missing or incompatible library. The message can also indicate a damaged file, blocked file, or incorrect application path.

Do I need Visual C++, DirectX, or .NET?

There is no direct evidence that any of those runtimes specifically fixes phonebook_object.dll. Install one only when the Sony Ericsson installer or a separate diagnostic message identifies it as required.

Should I copy the file to System32 or SysWOW64?

No. Keep an application-private DLL with the application that uses it. Copying it into both system directories can cause conflicts and does not address missing dependencies.

Should I run regsvr32?

Not unless the vendor specifically documents registration for this component. regsvr32 does not install every DLL.

Can Windows 11 or Windows 10 run Sony Ericsson PC Suite?

Compatibility is not verified for every legacy PC Suite release. The installer may require compatibility settings, and phone connectivity may depend on old drivers. If the application is essential for old data, preserve backups and consider an isolated legacy environment.

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