Yes, we found the culprit and it is fixed in the incoming Beta 2.
We added an option to open some pre-defined extensions such as XLSX or DOCX into their respective viewer apps.
Thanks for the feedback!
We found a solution for DisableDragDrop, but can you share your EXE file with us for the Search problem? If yes, you can zip it and upload it to https://wetransfer.com
This is a free file hosting service: after upload, they will give you a URL. Please send us this URL so that we can download the Zip archive.