Change Details

Made sure that I can still save and load PSBT file on windows. I don't have a windows computer to compile and test this, but the change is trivial enough that it should not be necessary.

Made sure that I can still save and load PSBT file in bitcoin-qt on Linux. I don't have a windows computer to compile and test this, but the change is trivial enough that it should not be necessary.

Made sure that I can still save and load PSBT file on windowsin bitcoin-qt on Linux. I don't have a windows computer to compile and test this, but the change is trivial enough that it should not be necessary.