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

File Extension: .XLTX

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

File Content: Spreadsheet

.XLTX files are spreadsheet files saved in Excel Template XML format. Here are the first 64 bytes of a sample .XLTX file dumped in HEX values:

50 4b 03 04 14 00 06 00 08 00 00 00 21 00 be 22 PK..............
9e f0 6e 01 00 00 a3 05 00 00 13 00 08 02 5b 43 ..n............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...............

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

<DIR>          docProps
<DIR>          xl
         1,443 [Content_Types].xml
<DIR>          _rels

.XLTX Excel Template XML file sample: Click sample.xltx to download.

.XLTX Excel Template XML files can be created and modified by these software:

• Apache OpenOffice - Opens and creates .XLTX Excel Template XML files
• Microsoft Excel 2010 - Opens and creates .DIF Data Interchange Format files