File Permissions Inaccurate

On Chrome, Firefox, and (I believe) Safari, I'm trying to configure the IMCE File browser to accept different file types. I've set the filter to *, thereby removing the restriction (or so it would seem). However, upon clicking "Upload," the Allowed file types are listed as jpg, jpeg, gif, png, txt, doc, xls, pdf, ppt, pps, odt, ods, and odp. I click "add files," and proceed to select the "all files" option in the system file browser. However, when I try to select another document type, it displays "Error: Invalid File Extension (filename).(extension)". We're using the File Browser on specific admin accounts only in order to upload files that our other users will need for their respective responsibilities.

Steps to reproduce:
-Configure an IMCE profile for specific roles.
-Set "Permitted file Extensions" to *, removing all restrictions on one of these IMCE profiles.
-Set the profile to a viable user role.
-Attempt to upload any file type other than the original predefined types.

Modules that may or may not be involved are the filefield_paths, filefield_sources, imce, imce_mkdir, imce_plupload, and the ckeditor modules. Sorry for not having more information - I only recently came into the project, and this issue appeared shortly after I'd started. If you need more info, I can dig around. Attached are two screenshots that display the issue.

EDIT: When putting a space in front of the asterisk, selecting files to upload, and then attempting the upload, the following happens: first, it states that "only files of type *" are allowed; second, it says "for security reasons, file x was renamed to file x.txt;" then it says that the file extension was rejected once again.