Check out some options how crypt files might be converted to xlsx format.
It seems that there are no programs that can decrypt and extract the content of a original Whatsapp Crypt archives (.crypt) as HTML document via the crypt to html conversion. After that, you can use the HTML and import it in a spreadsheet program with Excel formats support which you can do with any of the programs listed under html to xlsx converters.
Unfortunately, there is no detailed software record in the database for this conversion.
Additional links: Open crypt file, Open xlsx file
CRYPT
Files with crypt extension are most likely best known as chat history backups made from WhatsApp messaging app.
Files with crypt file extension may also be found as encrypted and renamed archives affected by the "Scatter" ransomware.
XLSX
Files with xlsx extension are s used by Microsoft Excel for its workbooks (spreadsheets) in Office Open XML format. XLSX is the latest spreadsheet format used by Excel with the adoption of XML formatting first used in Office 2007. While older xls files were in proprietary binary file format, xlsx spreadsheets use a somewhat altered XML scheme.
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