2.2.5.What is the purpose of filing in pre-conversion format? 

2.2.011If any document making up the international application has been prepared by conversion from a different electronic document format (pre-conversion format), the applicant may submit the document in that format too, preferably together with a statement that the international application in electronic form is a complete and accurate copy of the document in pre-conversion format. Each pre-conversion document must be in a format that fulfils the requirements stipulated in the decision of the President of 14 May 2021. It is recommended that pre-conversion documents be submitted as ZIP files. The purpose of filing in pre-conversion format is that, if an applicant discovers that the relevant part of the international application as filed in electronic form is not a complete and accurate copy of the document submitted in pre-conversion format, they may ask the EPO in its capacity as receiving Office to correct the international application accordingly within 30 months of the priority date.