As BAT (batch) files are basically text files, you can simple rename the extension from TXT to BAT. There just needs to be proper DOS commands in the batch files for it to work though.
Convert Simple text file to Batch file (executable).
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert txt to bat on Windows
A free source code and text editor for Windows
Convert from txt file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.