I think it may be to do with the other PC being on a Chinese Windows OS. And whenever I type something, I must always change it to English first. As I am just uploading a text file rather than entering the code somewhere, I am guessing that the PC reads the file as Chinese. Whatever the case, I am glad the save file is encrypted. It's too tempting to cheat with an unencrypted save file.
On another note, I don't quite get something about Blueprints.
Below the description it says, (Requires five time the Cost).
Does this mean that after level buying level 1 it will take five times as long to build a home, or that Blueprints level 2 will cost five times as much as level 1, or something else?