⎕CFTIE/⎕XFTIE/⎕FTIE confusion

APL+Win has three somewhat different file systems. ⎕FTIE and ⎕XFTIE are related and share a common file format - just the naming of files changes and that can be handled with cover functions.

However, the ⎕CFTIE system is entirely different. It uses a different internal format of course, but all the access functions are independent. Functionally you could replace these calls with ⎕XFTIE-equivalent calls on this side, except for one major discrepancy... the file tie numbers are independent!

IOW, you can tie a ⎕FTIE or ⎕XFTIE file to number 123 and at the same time ⎕CFTIE an entirely different file to 123 as well, and APL+Win handles them as two completely independent file ties. I'm not sure how you're going to manage that difference when an application ends up using both kinds of files at the same time (and some of them DO).