We have found 2 software records in our database eligible for .fm3 to .xls file format conversion.
fm3 to xls conversion pretty much certainly describes export of data from one of the known FileMaker Pro databases (.fm3) to a standard MS Excel spreadsheet format (.xls). As far as we know, you can only do this with FileMaker and perhaps only with a specific version of the tool.
Fortunately, you still might be able to find old versions of the tool on abandonware websites, version 3 of FileMaker can be for example download in the WinWorld Library.
Updated: August 14, 2023
FM3
Files with fm3 extension are used by FileMaker application version 3. They are used as some database files.
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.