How to create visual cues in M-Files Desktop UI

You could have a small piece of code which, when the value is over the limit, sets a lookup property to a value of "warning", or something.  You can put an icon on the value list item if you want.  You can also drive metadata-card-configuration rules from it.

The missing piece is that you'd need a piece of code to set the value, unless something like property calculator could do it.  That's not my area of expertise though, so maybe someone else could comment on that...

It would be relatively simple to create a validation script that would do what Craig suggests. However, scripting is not recommended as a long term solution given that it will be deprecated some time in the future.

I think it's important to be clear here that Microsoft is deprecating VBScript. The depreciation process will not be short. But yes, this is out of our control. 

When I say "write some code" the approach we should recommend is to use the vault application framework for new applications.

This is also why I highlight the use of configurable tools like the property calculator, as these also bypass the concerns around VBScript. 

I think it's important to be clear here that Microsoft is deprecating VBScript. The depreciation process will not be short. But yes, this is out of our control. 

When I say "write some code" the approach we should recommend is to use the vault application framework for new applications.

This is also why I highlight the use of configurable tools like the property calculator, as these also bypass the concerns around VBScript. 

Thank you both, I think we have a path for this prospect, cheers!