4gb file on C:/

ok i ust downloaded TreeSize and there is a 4gb file on my main root directory on c:/ it dosnt show up on windows explorer but shows up in treesize i thought it was the page file system i had it put to 4gb and i turned it down restarted treesize its still 4gb anyone know what it is? and i have hidden files and folders showing so…. yea… Treefile says its all files but i looked theres only about 1mb of files in root c:/
anyone know what i could be?
Answer #1
Name of the file? is it hiberfil.sys? If so its hibernation related
Answer #2
yea it dosnt say… all it says is .sys
Answer #3
Get into control panel>>folder options>view Uncheck “hide protected operating system files” and “hide extensions for known file types”
also set hidden files to “show hidden files and folders” , Then youll see it on explorer
Answer #4
Ok i guess it is the pagefile system(pagefile.sys) i guess it should go down to a gig once i restart, i havnt since i turned it down to 1gig