The text "D:\ *.* - CD-ROM" at the top of the file manager is normal, select "Disk" -> "Label Disk" to view the label.
Usage instructions are clearly told on the page I linked and also shown when you run the program abstract.com from DOSBox cmd (the .asm file is the source code and it also has the instructions).
You might also want to try a recent SVN build of DOSBox. There might have been some fixes to imgmount since version 0.74 which is quite old already.
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