Problem
One missing feature from Ax2012 that I severely miss in Dynamics 365 is the ability to search for examples of code across all my models.
The MetaData Search tries to help but is very limited
You might need it for finding examples of how code was written, checking for patterns in code that you want to emulate or certain keywords in your model that you want to change.
Solution
I understand Microsoft have something in progress to solve this, however for the time being I have found that the Search and Replace tool from Funduc Software (http://www.funduc.com/search_replace.htm) does an excellent job
After downloading, you can set it up to point to your k:\AosService\PackagesLocalDiectory\ (or to a model folder if necessary and look for files of type *.xml.
Do not forget to activate the option to search within subfolders!
tip: you can run multiple instances of the application at the same time
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