We should be able to type in a specific file extension in the File Type.
Ex. I'm trying to search for all .4tx files that we have, which are old 4sight Fax documents. These files are actually TIFF images, but we need to replace the extension on all of them so we can view them in our current environment, since we don't use that really old application. Box doesn't have a way to search specifically for those extensions so I have to search all file types and end up getting way more non relevant results.

If we have a file that has an incorrect file extension, we should have a way to replace that. Right now you have to download the file, rename it on the computer and then choose upload new file version. Or use box drive, which doesn't allow use to do an easier search to find all the files affected by the problem.