XLSM files can contain both an encrypted workbook and macro project protections. Preserve the original and identify which layer is blocking access.
An XLSM extension means the workbook may contain VBA macros; it does not reveal the encryption strength or the type of password. A password to open the file, a protected VBA project, and a locked sheet are separate cases.
Recovery process
An XLSM extension means the workbook may contain VBA macros; it does not reveal the encryption strength or the type of password. A password to open the file, a protected VBA project, and a locked sheet are separate cases.
Make a read-only copy and keep the original filename and extension. Do not rename XLSM to XLSX to bypass a prompt: that can remove or damage macro content and does not decrypt an encrypted workbook.
A complete copy of the XLSM file, the exact prompt, Office version, and non-secret password hints are more useful than a guessed file type. The service must confirm the profile before promising a path.
These details help with the first profile check.
The outlook depends on the actual encryption profile.
Common situations
A complete copy of the XLSM file, the exact prompt, Office version, and non-secret password hints are more useful than a guessed file type. The service must confirm the profile before promising a path.
Next step
Start with format detection and choose the appropriate path only after the file is identified.
