Current Dialog and SysOperationTempalte forms still contain old methods for working with files (filename..) and these frameworks(SysOperation and RunBase) were not updated to the new File approach. So right now, if you want to ask user for the file (in SysOperation or RunBase) you will need to write about 60 lines of code(for example ERFileImportUIBuilder, ERImportFormatDataSourceContractUIBuilder and about 10 more places in standard system that repeating these 60 lines each time)

It will be nice if Microsoft improves SysOperation and RunBase frameworks by adding internal support and processing of File parameters(like it was done in previous versions – you just need to use FileNameOpen EDT in dialog and all other stuff were handled by framework classes).