>You can just erase the first byte
Wouldn't that blow away the magic number/filesig? unless you're counting from zero like a good programmer should, then carry on fren.
Not saying its anything… but perhaps y'all want to peek again.
$ for i in $(ls -1 *.png); do strings ${i}; done | egrep -i ".(zip|png|jpg|jpeg|mp4|avi)" | sort -uClosed Fours/Monospace/saxmono.zipPKClosed Fours.zipClosed Fours.zip|Deceptive Fours/Captain-Redemption.png|YeP]Deceptive Fours.zipDeceptive Fours.ziplZSp.E.JPGmoon_get_preview1.pngmoon_get_preview2.pngOpen Fours/ahellya.zipOpen Fours/Another Danger - Font Cover 1.pngOpen Fours/Another Danger - Font Cover 3.pngOpen Fours/Another Danger - Font Cover 4.pngOpen Fours/basic_sans_serif_7/basic_sans_serif_7_screen.pngOpen Fours/BloodBlocks-Preview.pngOpen Fours/dolce_vita.zipOpen Fours/gogoposterpunch/GoGoPosterPunch.pngOpen Fours/gogoposterpunch/GoGoPosterPunch.png|ZOpen Fours/hackney_block/Hackney-Block.jpgOpen Fours/kenyan_coffee.zipOpen Fours/kenyan_coffee.zipdOpen Fours/libel_suit.zipOpen Fours/longhaul.zipOpen Fours/modern_sans.zipOpen Fours/modern_sans.zipuZSp%Open Fours/Monospace/code_saver.zipOpen Fours/Monospace/cq_mono.zipOpen Fours/Monospace/monkey.zipOpen Fours/Monospace/monkey.zipPKOpen Fours/Monospace/neoletters.zipOpen Fours/Monospace/secret_code.zipOpen Fours/Monospace/secret_code.zipuOpen Fours/Monospace/share_techmono.zipOpen Fours/Monospace/sv_basic_manual.zipOpen Fours/Monospace/white_rabbit.zipOpen Fours/Monospace/white_rabbit.zipuOpen Fours/municipal/SRC DESIGNS.pngOpen Fours/night_train_315/night_train_315.pngOpen Fours/nue_gothic_round.zipOpen Fours/nue_gothic_round.zip|WSp%POpen Fours/parmapetit.zipOpen Fours/poetsen_one.zipOpen Fours/poetsen_one.zip|YOpen Fours/quantify.zipOpen Fours/quinn.zipOpen Fours/quinn.zipPKOpen Fours/rounded_elegance.zipOpen Fours/rounded_elegance.zipPKOpen Fours/Sans/adam.zipOpen Fours/Sans/adam.zipuOpen Fours/Sans/alpaca.zipOpen Fours/Sansation_plate.jpgOpen Fours/sansation.zipOpen Fours/Sans/couture.zipOpen Fours/Sans/couture.zipPKOpen Fours/Sans/Evogria Pic.pngOpen Fours/Sans/evogria.zipOpen Fours/Sans/exo_2.zipOpen Fours/Sans/fresh_eaters.zipOpen Fours/Sans/fresh_eaters.ziptOpen Fours/Sans/mont.zipOpen Fours/Sans/mont.zipPKOpen Fours/Sans/moon_get_preview1.pngOpen Fours/Sans/moon_get_preview2.pngOpen Fours/Sans/moon_get.zipOpen Fours/Sans/she_smiles.zipOpen Fours/Serif/antenna.zipOpen Fours/Serif/azonix.zipOpen Fours/Serif/azonix.zipuYUPOpen Fours/Serif/barkentina_1.zipOpen Fours/Serif/FoglihtenNo07_720f.pngOpen Fours/Serif/foglihtenno07.zipOpen Fours/Serif/foglihten.zipOpen Fours/Serif/fogtwono5.zipOpen Fours/Serif/salinas.zipOpen Fours/Serif/salinas.zipPKOpen Fours/Serif/typoslab_750.pngOpen Fours/Serif/znikomit.zipOpen Fours/SF Movie Poster Sample.jpgOpen Fours/sf_movie_poster.zipOpen Fours/Stranger Cover.PNGOpen Fours/the_next_font.zipOpen Fours/the_next_font.zipPKOpen Fours/typography_times.zipOpen Fours/typography_times.zip|Open Fours/typo_slab.zipOpen Fours/walkway.zipPreview.pngSF Movie Poster Sample.jpgTrapped Fours.ziptyposlab_750.png
>Outside of my expertise. No telling what's in those files, though.
Truth. Unfortunately only one way to find out. If anyone attempts, best to do so offline and airgapped.