1706 Microsoft Works Spreadsheet 6-9 Spreadsheet Microsoft Works is a discontinued office suite developed by Microsoft. XLR files can contain either spreadsheet or chart data, and can be opened with Microsoft Works, Excel, and the Excel Viewer. 1 Digital Preservation Department / The National Archives 21 Jun 2016 This format can be identified via a container signature in DROID version 6 or later. The PRONOM database cannot currently represent container signatures. 21 Jun 2016 fmt/901 PUID 93 Microsoft Corporation Microsoft Corporation 93 Microsoft Corporation Microsoft Corporation xlr File extension Has priority over 684 Microsoft Excel 97-2003 Workbook (xls) 8 & 8X