Hi Mohammed, I typically do that by simple copy paste of the raw data from the txt file to an Excel sheet or to Origin and doing the ploting there.
This is very easy as you can mark averything in the txt file at once. Normally you should also be able to export the raw data from your rheometer directly to an excel file and then you can either transfer the data to Origin or directly work in Excel.
TA Instruments Trios software can import txt files using a built-in text import wizzard. Go to the TAI website (link below) and download a free version of Trios 5.1.1.