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File Format
Name AOI
Extension(s) .axc
MIME Type(s) text/plain
For another AOI format, see AOI (Art of Illusion).

Application Object Index files for Microsoft Dynamics AX. You can delete this file when the AOS is stopped. Be sure to delete this when you have copied layers from one AX installation to an other.



  • A - Application
  • O - Object
  • I - Index

The first character indicates the owner of the file:

  • a: application
  • k: kernel

The second character indicates the content of the file:

  • l: label
  • o: object
  • t: text
  • d: developer documentation
  • h: help

And the third character indicates the type of file:d: data

  • i: index
  • c: cache
  • t: temporary



See Also

ALC: Application Label Cache - These files contain the application label cache. These files can be deleted when the AOS is stopped.

ALD Application Label Data file - These files contain the labels and label comments for a specific language of a label file.

ALI: Application Label Index files - The .ali files contain an index to the .ald files. These files can be deleted when the AOS is stopped.

ALT: Application Label Temporary files - These files contain new labels before they are committed to the .ald file. AOI extension: Application Object Index file

ADD: Application Developer Documentation Data files - These files contain the documentation that is found under the Application Developer Documentation node. These files are localized, just like label files.

ADI: Application Developer Documentation Index files - This is the index to the ADD file. AHD extension: Application Help Data files The AHD file contains the documentation aimed at the end user. In the AOT, this is found in the “Application Documentation” node.

AHI: Application Help Index files - This is the index to the AHD file. AOD extension: Application Object Data file This is the ‘AX layer file’, each of these files represents one layer.

KHD: Kernel Help Documentation files - These files contain the kernel help documentation you can find in the AOT in the tree node System Documentation.KHI extension: Kernel Help Index files The KHI file is the index to the Kernel Help file. Located in Server/bin:

KTD: Kernel Text Data file - This file contains system text strings. These are used in the interface of AX and for system messages.KTI extension: Kernel Text Index file This is the index to the KTD file. Client side (not following the naming logic):

AUC: Application Unicode Object Cache file - (as of AX 4.0) This file is created on the client side, and is used to improve performance by caching AX objects. When you are in the situation where an AX client keeps using ‘old code’, or where something works on one client and not on the other, removing the AUC file might be the solution. You can find this file in the directory C:\Documents and Settings\[USERNAME]\Local Settings\Application Data for xp, or C:\Users\USERNAME\AppData\Local for vista.

AOC: Axapta Object Cache file - (Until Axapta 3). This is the ‘old’ version of the AUC file but serves the same purpose.

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