Identify which program created the .tax file
Try opening it with the original tax software
If needed, install the software that matches the file type
Right-click the file and choose Open With
Select the appropriate tax application
If the file is compressed or archived, extract it first
If the file is from a different platform, use the matching version of the software
Check the file extension to confirm it is באמת .tax and not a renamed file
If the file still will not open, update the tax software
Contact the software provider for file compatibility support