Error Code: 80029c4a Description:Error loading type library/DLL

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Quickbooks Data recovery - Error Code: 80029c4a Description:Error loading type library/DLL

Quickbooks Data recovery

Quickbooks file repair - Error Code: 80029c4a Description:Error loading type library/DLL


Have you ever encountered this error on Quickbooks Desktop?

Error Code: 80029c4a Description:Error loading type library/DLL while trying to open your company file?

In this article i am going to discuss why its happening and how to identify the point of failure and the fix for it.

first we need to identify if the problem is with the Quickbooks Software or your Quickbooks Company file, In order to check that try opening a sample company file. If the sample file opens fine it clearly means that the problem area is your quickbooks company file and you might have to restore a good backup copy or send it for recovery.  A data file can be damaged because of multiple reasons like power failure, incorrect multi-user setup, human error and many more.

And ff you are getting the same error while opening a sample file as well it means that the problem area is your Quickbooks Software and there could be couple is fixes for it.

Solution 1:

The first step would be to update your quickbooks to the latest release. Again there are two ways to update quickbooks, Automatic & manual. I would suggest to go for the manual update.  Click here to get the latest updates for Quickbooks .


Solution 2:

An antivirus can also be a point of failure, disable your antivirus and check if you are able to open your quickbooks successfully or not because at times antivirus software treats some quickbooks components as virus and tries to block then. If disabling your antivirus helps then configure it with Quickbooks allowing full access.


Solution 3:

Repair or reinstall your quickbooks. At times repair and reinstall do work but if you really want to save some time then go for a clean install of quickbooks which is a guaranteed fix where in the problem area is the software itself.


Following the above troubleshooting steps religiously will surely resolve your issue.


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The user is already logged into the company file. If possible try logging in using a different username

The user is already logged into the company file. If possible try logging in using a different username
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Ever came across this error?

QB Desktop attempt log in with the user name failed - The user is already logged into the company file. If possible try logging in using a different username

The user is already logged into the company file. If possible try logging in using a different username

There can be multiple reasons for QuickBooks to generate this error. Digging down the error this time I found something completely different, new culprit which was causing the problem.

In this particular case it was Quickbooks Premier 2017 on a multi-user environment with QBW files on the server ( Server 2008) with QB Database Server Manager running and 3 computers (two with windows 10 and one with windows 8)

The situation was when a user closes out of QuickBooks and when they try to log back into the same company file again they get the error “The attempt to log in with username “username” failed. The user is already logged into the company file. If possible try logging in using a different username.” Restarting the Server or the QB Database Server Manager allows them to log back in but this happens each time a user logs into a company file and we can’t just restart the server all the time.

I did all the basic troubleshooting steps like killing the qbw32 process from the task manager but did not help. The file was clean as no errors were detected while verifying the file. Still went ahead and ran a repair but the problem persists, Thinking it could be a problem with the user list as at times it gets damaged I deleted all the users and created new one but that didn’t help either.

Further digging down found that QuickBooks messenger was causing the problem though the QuickBooks messenger option was disabled on all three workstations.

Finally the FIX for “The user is already logged into the company file. If possible try logging in using a different username”

Browse to C:\Programs Files (x86)\Intuit\QuickBooks 2017″ folder.  and rename QuickBooksMessaging.exe to QuickBooksMessaging.exe.old.

Did that on all three workstations and haven’t seen that frustrating error since then..

Hope this helps if you are experiencing a very similar issue

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What are quickbooks file extensions

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Has anyone asked you about the type of quickbooks file extention? Most likely this questions must have come from your accountant for a tech support representative. Well a extension is a three- or four-letter abbreviation that signifies the file type. For example, in letter.docx the filename is letter and the extension is docx. or .CSV for Comma separated, variable length file (Open in Excel), .exe for PC Application etc etc In the very same way Quickbooks can open the following file extensions mentioned below.

Quickbooks working file extension for Windows

File extension File type Description
*.QBW QuickBooks Company file The QBW format is associated with Intuit QuickBooks software. It uses QBW files to store financial data, templates, letters, logos, and images for a company.
*.QBB QuickBooks Backup file format QBB files are backups of QBW files which store a companies financial records, templates, logos, letters and images.
*.QBM QuickBooks Portable file Compressed version of the QuickBooks company file. *.QBM files are ideal for sharing because of the smaller file size.
*.QBI QuickBooks Image file The *.QBI file “holds” transactions that have been written until they are posted to the hard drive
*.QBR QuickBooks Report template When you export the template for a memorized report, QuickBooks saves the file with a .QBR extension.
*.DES Layout designer template export file QuickBooks provides a variety of templates that you can use for your forms
*.QBO QuickBooks Online Bank Statement File This type of file contains an electronic bank statement downloaded from a financial institution’s website.
*.INI Initialization File A config log file for QuickBooks.
*.LGB Little Green Box Related to SDK log files for QuickBooks  that contains encrypted information about user names and passwords. It is utilized when an application needs to communicate and connect with QuickBooks (like QuickBooks Point of Sale) while it is unattended or closed. The user name and password stored in this file is utilized to connect with the Sybase server.
*.QWC QuickBooks Web Connector This file contains encrypted information about 3rd party applications integrated with QuickBooks
*.QBP QuickBooks Print file This file stores form settings used by QuickBooks to print the form.
*.WPR.INI Windows Print file This file stores QuickBooks printer settings

Accountants File Extension

File extension File type Description
*.AIF Accountant’s copy Import File Created when Accountant’s copy is exported; to be used for importing into user’s company file
*.QBA QuickBooks Accountant copy working file File used for accountant’s review
*.QBA.TLG Transaction log file for the Accountant’s copy When you back up an accountant’s review copy, QuickBooks starts a log of transactions that you’ve entered since the last time you backed up. In case of accidental loss of data, Intuit Technical Support can use your most recent backup in conjunction with the transaction log file to recover your data
*.QBJ General Journal Entries The .QBJ file can be used to easily incorporate general journal entries creaetd by your accountant into your company file.
*.QBX Accountant’s review copy (export file) Backup made for Accountant’s copy of user’s company file. When Accountant restores this, it is an Accountant’s Copy of the file.
*.QBY Accountant’s copy import file. When your accountant is finished making changes in an Accountant’s Copy, he or she provides you with a .QBY file to be imported into your company file.

Utilities and Log file extension

File extension File type Description
*.AVI Audio Video Interleave A multimedia format that contains both audio and video data in a file. This is used in QuickBooks for “Show Me” files
*.IIF Intuit Interchange Format May be created for importing lists and/or transactions.
*.ND Network Data File A configuration file that allows access to the QuickBooks company file.
*.RTP Used for auto-patch
*.TLG Transaction log file Keeps track of changes to the file since the last backup.
*.WAV Windows sound format Sound Advice files (used in CD versions of QuickBooks)
*.Qbwin.log QB Windows log File is created/updated when a user runs verify and/or rebuild. Logs problems found/situations corrected
*.QBBackup.tmp QB Back temp folders File created during failed online or scheduled backup with date and time stamp. Cannot be used to restore data.
*.Temp1234.qbt File created during pass 1 of rebuild, and deleted automatically when rebuild is completed.
*.QBSDK.log Logs for errors in QuickBooks and other services such as web connectors.
*.QWC.log QB Web Connector log Logs for Web Connector errors and process.
*.SyncManagerLogger.log  Sync Manager log Logs for Sync errors and activities.
*.ECML  Entitlement file Stores installation license, and registration data

Payroll Files Extension (US Only)


File extension Description
*.1PA Files used to create forms 940 and 941 (Quickbooks for Windows 4.0 through QuickBooks 2004)
*.TXT & *.SET Used in QuickPay version 2.0/2.1
Prddesvr.exe, Product.fam, Perwin95.ini, Perrval.dll These files are used for printing 940/941 forms.
Taxtbl.usa Integrated Payroll tax table file

Quickbooks Statement Writer file extension

File extension File type
*.QSM QSW Statement file
*.QSS QSW Appearance file
*.QST QSW Template file

QuickBooks Fixed Asset Manager (US Only)

File extension Description
*.Fx0 Compressed FAM data file. Stores asset data
*.Fx1 Stores system data
*.Mx0 Header file
*.FPx Stores report data
*.FXR FAM backup sync log file
*.FIM Stores CSV import data headers

Quickbooks for Mac file extension (US only)

File extension File type/ Description
*.QB2016 QuickBooks 2016 for Mac company data file
*.QB2015 QuickBooks 2015 for Mac company data file
*.QB2014 QuickBooks 2014 for Mac company data file
*.QBB Windows compatible QuickBooks for Mac backup file
*.QBMB QuickBooks for Mac disk backup file (QuickBooks for Mac 2012 and earlier)
*.DMG QuickBooks for Mac 2013 and later use the Apple disk image to create backups
*.plist Preference files that store registration and any preferences set within QuickBooks

Hope this was helpful.

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