Ext Decoder
Spreadsheet

.xlsm — Macro-Enabled Excel Spreadsheet

Same as .xlsx but explicitly flagged as containing macros (VBA code) that can run when the file is opened.

Commonly opened with
  • Microsoft Excel
Supported platforms
  • Windows
  • macOS
  • Linux
  • Web / Cross-platform
Editable?
Yes, with common software
Viewable without special tools?
Usually, yes
Commonly converted to
  • .xlsx
  • .csv
Inherent format risk
Use some caution
Safety guidance (not a guarantee)

This format can contain macros or embedded scripts that run code when enabled. Keep macros disabled unless you trust the source and specifically expect them.

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Frequently asked questions

What is a .xlsm file?

Same as .xlsx but explicitly flagged as containing macros (VBA code) that can run when the file is opened.

Can I edit a .xlsm file?

Yes — .xlsm files are commonly editable with software such as Microsoft Excel.

Does having a .xlsm extension mean the file is safe?

No single extension can guarantee that. This format can contain macros or embedded scripts that run code when enabled. Keep macros disabled unless you trust the source and specifically expect them. Always consider where the file came from, not just its name.

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