Merging .837 files

I am working with a program called Altova, which converts .837 files (a format used by healthcare companies for patient information) to .txt files. Right now I have to convert each file one by one, which takes a lot of time. If anyone knows how to easily merge all the files into one .837 file or if anyone is familiar with Altova, and knows how to run a whole batch within that program your imput would be greatly appreciated. Thank you, Andre Philipp

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