Another post about shared parameters. Here's the warning you'll find in a shared parameter file.
If you've dabbled or dug in seriously with shared parameters you've most likely made a mistake naming or choosing the type for a parameter. The interface Revit provides doesn't allow you to change a parameter once you've entered the data and finished. The only route is to delete and redo....or is it?
It is just a text file technically so you can open it with Windows application, Notepad. Best not to open it in Word or similar since you could inadvertently save formatting data in the file rendering it useless to Revit.
Required Disclaimer: In light of the above image doing anything I suggest will not be supported by anyone if something goes wrong, you venture out on "Thin Ice" at your own peril. If you have used the shared parameter in a project and have data associated with it don't go here...walk away. You'll lose data. Scared yet? No...okay carry on...
If you examine a shared parameter file, each value has a role.
If you need to rename the parameter, rename it here >
If you need to redefine the type, do it here >
Keep in mind that you have to enter the type value exactly as Revit expects it to be written otherwise it isn't going to work.
If you want to get a parameter from one file into another, just copy the entire string from one to the other.
I don't know how many people will care about this or perhaps run away but during a discussion about this recently I tried it to fix something and found it helpful.
This is only really useful if you are in the process of creating parameters and make a mistake. If you've already implemented a project or content using the parameters it may be more "costly" to change than it is worth. You be the judge.