Well, that's frustrating.
I've got an older version which is currently ignoring at least one "$" used as a continuation flag. Inexplicably it also ignores the "C" character unless there are more characters on the same line; probably the same problem as the missing "$" and maybe from looking for words/character groups.
I used the internal image enhancement to force all the color characters to be seen using Brightness 100.
I did not find a uniform-space character option and the use of proportional spaces causes some column shifts.
With Notepad++ I could strip off the leading line numbers, but fixing the indentation will be a manual process. It seems as if the tabs are set to duplicate location and not an accurate number of characters.
A text-backed PDF will probably have the same problem - Postscript/PDF records the location on the page rather than as a matrix location of row and column.