Convert XLSMHTML to XLSX

Understanding xlsmhtml and xlsx file formats

XLSMHTML is a rarely used file format that represents Microsoft Excel spreadsheets saved as MHTML (MIME HTML) archives. These files encapsulate the spreadsheet's data, formatting, and embedded objects in a single web archive, making them viewable in browsers but not directly editable in Excel.

XLSX is the modern, widely used Microsoft Excel spreadsheet format based on the Open XML standard. It supports advanced features, formulas, and is compatible with most spreadsheet software.

Why convert xlsmhtml to xlsx?

Converting xlsmhtml to xlsx allows you to regain full editing capabilities in Excel, preserve formulas, and ensure compatibility with modern spreadsheet tools. XLSX files are also more secure and efficient for data manipulation and sharing.

How to convert xlsmhtml to xlsx

Since XLSMHTML is not natively supported by Excel, conversion requires a two-step process:

1. Open the xlsmhtml file in Microsoft Excel: Launch Excel and use File → Open to select your .xlsmhtml file. Excel will attempt to interpret the MHTML content and display the spreadsheet.
2. Save as XLSX: Once the file is open, go to File → Save As and choose Excel Workbook (*.xlsx) as the file type. Click Save to complete the conversion.

Best software for xlsmhtml to xlsx conversion

The most reliable tool for this conversion is Microsoft Excel (preferably Excel 2016 or later). Excel's built-in support for MHTML files ensures the highest fidelity when converting to XLSX.

If you do not have access to Microsoft Excel, you can try LibreOffice Calc as an alternative. Open the xlsmhtml file in Calc, then use File → Save As and select XLSX as the output format. However, formatting and advanced features may not be fully preserved.

Online converters

There are few online converters that support xlsmhtml to xlsx directly due to the rarity of the format. If you find a service, ensure it is reputable and secure before uploading sensitive data.

Summary

To convert xlsmhtml to xlsx, use Microsoft Excel to open and save the file in the desired format. This ensures the best compatibility and data preservation.