1) seeing notification that file not found - first change the file name to something short like number or letter(allways work), then make your changes & rename it to a short name before saving/extacting.
2) "there is not enough space" to open it - usually it may happen if you have too much catch in the program - your last works & all the memory from it / heavy swatches still in the librarie a side../ maybe lot of brushes that you downloaded or did by yourself - thats if the file small or it may happen when the file large & complex - so open it from "file" at the program menu, not direct from folder or archive.
PNG & vectors: To open the files properly - at first extract them -
its more about AI Vector files rarther than PNG files that can be open up straight from Winrar or other archives without any problem,
When it comes to PNG files you just clicking the file from Winrar archive & see it immediately in your gallery viewer even if it's not extracted yet.
Vectors - because sometimes in some Illustrator or other graphic programs the file may behave like there is no action/or command was set up at all & the file just won't open or for example in Adobe Illustrator may appear a notion that "there is not enough space to open the file", if that's the case you just need to open the file from the graphic program open command(menu bar & not keyboard shortcuts, nor from archive or the folder after extraction.
If there is a problem to save(mostly in PNG) or to open (not common in PNG) - rename the file after extraction it may be ID:1err(file name characters) or the default program language that you are using(alphabet) if it's not program size limit when using 300ppi.
Vectors in store suitable the most to Adobe Illustrator programs - compatible with Illustrator 17 & above versions.
If you resave large/complex files after making colour or shape changes it's better to save them with a brand new name when it comes to: serial files(numbers 1,2,3 & other order / kind of order) or long names or maybe files with a name in a different alphabet / language than the graphic program you working on, you avoid notifications when saving file - err.notif like there is no option to export file in high definition(300pp) or at all, or other graphic programs err.notif.
if there are some & you still can't save the file after renaming it,
than it's better to give a completely different name or save in a new folder or both mentioned previously,
after that you can rename the file again when finish working with it(if you are working by file name to keep some order).
This kind of problem source more frequent in serial file long names with numeric order, ID:1 err & similar errors may appear in program notification window.
