We have found one software suitable in our database for this conversion.
iif to xls conversion is probably used for some kind of reporting purpose, typically to generate a bill of materials or similar type of list from 3D model or CAD file. We have not found anything specific about this subject, so perhaps it would be best to contact Maya support or to reach out to some online community. But reporting functions are common nowadays.
Updated: March 27, 2023
IFF
Files with iff file extension might be found as images in Autodesk Maya Image Interchange format. Special bitmap image file type.
XLS
Files with xls extension are best known as spreadsheets from Microsoft Excel. A spreadsheet is basically a grid of cells sorted in rows and columns. Each cell can contain text, numeric or formula data. Excel XLS spreadsheets can be opened in most other similar programs, such as OpenOffice.org Calc.