Hi Gilbert please find below methods
1. Each time you need to spy the "Dialog" object and identify "text" property value then add to repository like, [open|Choose File to Upload()|File Upload]
2. you can use [".*"] value for 'text' and "0" for index in OR will work some cases
[Note : This will work if you are handling single dialog on that time]
Set objDesc = Description.Create
objDesc("micclass").Value = "Dialog"
Set objDescchld = Desktop.Childobjects(objDesc)
[Note: This will return all the childobjects if there are more objects matches, then you need to identify yours]