Thanks very much to ripsaw8080 for tracking down the exact cause of the problem I am experiencing with the Pyrosim pyrometallurgical simulator. I understand now that the DOSBox COPY command is indeed able to concatenate files, but is very fussy about the spaces in a command such as COPY file1.txt + …

I expect that it's possible that your installation concatenation was done using some other method than the COPY command. I certainly couldn't get the simple example shown in my first message to work for me.

Thanks for the suggestion. I'll take a look at 4DOS.

I have really enjoyed using DOSBox on a daily basis for the past few months (ever since getting my Windows 7 64 bit computer), and use it to run a wide variety of old DOS applications. However, there is one glitch I am currently experiencing with a pyrometallurgy simulator called Pyrosim. I think I …