The File Extensions Database


.ATI File Extension

  • Developer by: Microsoft
  • Category: Backup Files
  • Format: Binary

What is an .ATI file?

.ATI is Office Accounting Updated Company File

Compressed accounting database backup saved by Microsoft Office Accounting, a program used to integrate with online banking systems; stores a backup copy of a .ATE file that was sent from a company to an accountant; used to import updated data back into a company's accounting database.

NOTE: Microsoft Office Accounting was discontinued in 2009.

How to solve problems with ATI files

  • Associate the ATI file extension with the correct application. On :
    Windows: Right click on any ATI file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.ATI files". Mac: Right click (or Ctrl-click) the ATI file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .ATI is Office Accounting Updated Company File. Because only the current version supports the latest ATI file format. Search, therefore, e.g. on the Microsoft manufacturer website after an available .ATI is Office Accounting Updated Company File update.
  • To make sure that your ATI file is not corrupted or virus-infected, get the file again and scan it with antivirus software.