Windows 10: Why can't I open mp4 files anymore?

I used to be able to view my clips and such, but suddenly I've been hit with this message upon double clicking to open them or just pressing open on them through the file explorer. This happens with EVERY mp4 file I have and try to open now and even happens with newer ones I've downloaded after the problem.However I can still view them if I use "open with" and select a media source like windows media player or photos

:)

 

USB doesn't display MP4 file!

I have a 300kb mix of .png, .jpg, .pdf files on a 4Gb USB drive. I added a 2Gb MP4 movie but it doesn't display in the drive files. I used CCleaner to check the drive F files .. it only shows up as 2Gb of OTHER FILES, but not in the listed files.

Any (constructive) suggestions welcome. I can't remove it as it doesn't show in the file list.

 

Playing MP4 files

MP4 is a container file, a lot depends on the codecs within that.
MP4 can be played with Windows 10 with Films & TV, Photos, Windows Media Player, and VLC.
If those can't then there must be something odd/unusual in the file.

Right click the File > Properties > Details Tab.
see if that gives you more info, should be some info on the video/audio but not codecs.

Try the suggestions from post #3.

You have to be careful as viruses are propogated by people simply changing the filename extension and auto-forwarding via an infected PC and a compromised address list.
So a targeted scan with AV is necessary for every file attachement even if apparently from someone you know.

 

opening .dds files with gimp

Simply, HOW? I got the DDS plugin but the POS wont open DDS files still. Can someone give me a step-by-step rundown of how to install the DDS plugin for gimp so I know if I'm missing something?