If you tell me or its file size , I can help you determine if it's a standard backup or something suspicious.
Right-click the file and select 7-Zip > Open archive . Command Line: Run 7z l tax2.7z (the l stands for "list"). On macOS/Linux tax2.7z
Data files from programs like QuickBooks or TurboTax. If you tell me or its file size
Scanned copies of tax returns, W-2s, 1099s, or receipts. tax2.7z