What is XLSB? XLSB, short name for Excel Spreadsheet Binary, is used as the file extension for spreadsheet files in Excel Spreadsheet Binary format. .XLSB files are binary files that can be opened by Microsoft Excel software. See the sample .XLSB file included below.

File Extension: .XLSB

MIME Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

File Content: Spreadsheet

.XLSB files are spreadsheet files saved in Excel Spreadsheet Binary format. Here are the first 64 bytes of a sample .XLSB file dumped in HEX values:

50 4b 03 04 14 00 06 00 08 00 00 00 21 00 69 9a PK............i.
72 48 98 01 00 00 f5 05 00 00 13 00 08 02 5b 43 rH.............C
6f 6e 74 65 6e 74 5f 54 79 70 65 73 5d 2e 78 6d ontent_Types..xm
6c 20 a2 04 02 28 a0 00 02 00 00 00 00 00 00 00 l...............

.XLSB files are actually ZIP files. See the ZIP identifier "PK" in the above HEX dump. When an .XLSB file is extracted by a ZIP tool, you will these files and folers:

<DIR>          docProps
<DIR>          xl
         1,525 [Content_Types].xml
<DIR>          _rels

.XLSB Excel Spreadsheet Binary file sample: Click sample.xlsb to download.

.XLSB Excel Spreadsheet Binary files can be created and modified by these software:

• Apache OpenOffice - Opens and creates .XLSB Excel Spreadsheet Binary files
• Microsoft Excel 2010 - Opens and creates .DIF Data Interchange Format files