I have many different types of files in a folder – .php, .css, .htm, .js, .docx, .xls, etc.
The only file type that Windows (viewed from Windows Explorer) actually shows the extension are the .php files.
Why is this?
Windows – Why does Windows append .php to the php files but not other ones
file extensionPHPwindows
Related Solutions
You can use the TrID tool which has a growing library of file type definitions for identifying files with.
Wildcards are supported, so in your example you could just put all the images to be examined in a folder, e.g. C:\verifyimages - then you can use the command:
trid C:\verifyimages\*
This will examine all files in the verifyimages folder.
There is also a GUI version available, TrIDNet:
There is documentation available on how you can you can easily integrate TrID or TrIDNet into Windows Explorer and Total Commander:
Windows Explorer
Total Commander
You can use TrID for that. There are versions for both Windows and Linux. It can scan multiple files and with the "-ae" switch it can rename each one adding the guessed extension.
Disclaimer: I'm TrID's developer.
Best Answer
Two things are most likely on your system for this to happen:
The option Hide extensions for known file types is checked.
You haven't registered the PHP filetype to your system and thus is an unrecognised file format.
These combined will show .php file extensions while other documents are hidden.
You can change this when you open a folder and go to: Tools > Options > View
There you'll see the option to uncheck Hide extensions for known file types. Do so and save.
If you want to hide the PHP file extensions, leave the extensions option hidden and just register the filetype.