I need your help because I doesn't have this file to customize my form, I only install Instrumentation and wiring doesn't exist that file.
Thank you for posting your query in Bentley Plant Forum.
Kindly provide some clarity on what is the exact requirement. Also confirm the version of AutoPLANT and Instrumentation and Wiring so that we can assist you with your requirement.
However, we have uploaded the propdlgs.zip file for you. Please find the link below to download.
Hope this helps.