FODS to XLSM Converter

The FODS format is the Flat XML implementation of the OpenDocument Spreadsheet standard (ISO/IEC 26300). Unlike the standard ODS format, which utilizes a ZIP-compressed container holding multiple XML manifests and assets, FODS stores the entire spreadsheet document—including content, styles, and metadata—within a single, uncompressed human-readable XML file. This structure facilitates version control (e.g., Git) and direct XML manipulation via XSLT transformations without the need for decompression.

FODS files are natively supported by the LibreOffice and Apache OpenOffice suites, which utilize the underlying OpenDocument structure. They can also be opened in any text editor or XML parser for code-level inspection. Microsoft Excel requires third-party plugins or ODF converters to correctly interpret the Flat XML schema.

The XLSM format is a macro-enabled spreadsheet file created by Microsoft Excel 2007 and later versions, utilizing the Office Open XML (OOXML) standard (ISO/IEC 29500). Unlike the standard XLSX format, XLSM files store embedded macros written in Visual Basic for Applications (VBA), allowing for automation and complex scripting within the workbook. The file structure relies on ZIP compression to contain XML documents for data, styles, and macro binary parts (vbaProject.bin), presenting a security risk that often requires user authorization to execute active content.

XLSM files open natively in Microsoft Excel (2007+) on Windows and macOS, which provides full VBA execution support. For non-Microsoft environments, LibreOffice Calc, OpenOffice Calc, and WPS Office can open these files and view data, though VBA macro execution compatibility varies significantly. Google Sheets can import XLSM data but strips the VBA macros, converting the file to its native format without automation features.