Mysterious files in c:\windows\temp folder

[galcott]

I've been trying to find out why a client's Windows 7 machine is low on disk space. In the c:\windows\temp folder I found over 4000 files, all the exact same size, totaling 950GB, with file names as shown in this screen shot. I assume I can delete these but I have no idea what they are. I opened one in a hex editor and it doesn't contain any readable text that would enable me to identify it. Can anyone identify these?

 

[SIW2]

show file extensions and if they are .cab you can have a look inside with 7-zip if you are curious.

 

[galcott]

They don't have any extensions. I added the .cab extension to one of them but 7-Zip wouldn't open it, said it wasn't a valid archive.

 

[SIW2]

They are in the temp folder, so why not delete them and free up the space

Windows 7 temp folder filled with cab files - Windows - Spiceworks Community

cab_xxxx files found in WINDOWS\TEMP folder


Windows 7 log file compression bug can fill up your hard drive – Computerworld