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.AHI File Extension

File Type	Dynamics AX Online Help Index File
File Format	File
Common?	No
File Description	Index of help data (.AHD) files used by Microsoft Dynamics AX, a business management program; provides faster access to help documentation and search capabilities for Dynamics AX online help.
Program(s) that open ahi files	Windows: Microsoft Dynamics AX

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/ahi