JAConverter.exe
From TrainzOnline
JAConverter.exe is located in the bin folder. It is used to modify .ja files during patching and not only.
Command-line options
patchapply
Syntax:
JAConverter patchapply "file.ja.pbk" "file-diff.ja" "file.ja"
This command opens the file.ja from a previously made backup (file.ja.pbk), appedns the content from file-diff.ja and writes the new file, file.ja.
Example:
JAConverter patchapply "builtin\1.ja.pbk" "builtin\1-diff.ja" "builtin\1.ja"
This command opens the 1.ja backup (1.ja.pbk), appedns the content from 1-diff.ja and writes the new file, 1.ja.