FileXIdentifier

Generally speaking, you can rely on Windows to recognize and open files accordingly using the correct software solution in the vast majority of cases. Unfortunately, there are times when you come across rather obscure files with not extension whatsoever as well as the ones that do not feature the correct tag.
FileXIdentifier is a lightweight application that can help you detect the true file extension of a file relying on the TrIDLib standard. 

Provides you with different alternatives that it scores

The application does not require setup and hence, you can decompress the archive in any desired location on your computer. Upon launch, you come face to face with a small, but intuitive interface that is very unlikely to give you any troubles.
While you can browse for the file that you want to verify, you will be happy to learn that the utility also supports drag and drop. Irrespective of the method you select, the tool displays the path to the file in the dedicated checkbox.
The app provides you with helpful insight about the file type and extension but also includes the scores of the options displayed. Based on the analysis, you can preview the points in numbers and percentages alongside the type and extension.

It can help you prevent malware infections

A common concern for most users stems from the fact that malware can easily rename files and disguise their actual type. In fact, there are numerous well-known software solutions that are considered extension independent and thus, recognize and open their associated files regardless of their name.
The tool can help you check out various files that you have received unsolicited via email and that may not have been scanned properly by mail filters. Alternatively, you can analyze files that have a modified hash or you have reasons to suspect can include malicious components.
As a side note, it would have been useful if you could resize the interface especially when you want to explore all variants provided by the utility.

A useful tool that can help you detect the files' true extensions

In spite of the fact that it does not come in the most attractive package, then small utility provides you with valuable information regarding the file type and extension and ultimately, FileXIdentifier can save you a lot of headaches.