Share some code here, do you save the encrypted file content out on the disk or any physical storage and check it manually for existence?
In the past i've used these: var zsqr = (int)(_) => { int? x = null; return x ??= 0; }; var osqr = (int)(_) => { int? x = null; return x ??= 1; }; Still need more research for...
Do you register it with Admin rights?