Trying to cleanup many individual, macro-enabled workbooks with tables to rollup data with Power BI

[npasha1]

Hello, I have a data analysis project to roll up multiple individual, macro-enabled Excel workbooks with tables and formulas. Each workbook contains 31 individual sheets (one for each day of the month). The 31 individual day worksheets each contain nested Excel tables with formulas and are password protected. I have the password. The workbook also includes a Monthly Totals worksheet, an Instructions worksheet, and a FAQ worksheet. I want to roll them up using Power BI in order to build dashboards and PivotTable reports. I wanted to write a macro to loop through the folder where the individual workbooks are stored to:

1. Delete the unneeded worksheets (Monthly Totals, Instructions, FAQ);
2. Convert all tables to ranges;
3. Copy/paste special values to convert formulas to numbers;
4. Save each file

I was able to develop a macro that successfully completes Step 1 above, but neither Step 2 nor Step 3. Hopefully I'm not making this more difficult than it needs to be. Also, do the individual files need to be converted to .xlsx format before attempting to roll them up in Power BI?

Any help would be greatly appreciated.

Thank you.