Definitely not screen accurate, but very close. The fonts don't really match with the original props and the error remains on the yellow page.
"Co/" does not mean anything. The correct form is "c/o" which is an abbreviation for "care of".
Other than that it is an absolutely amazing job and very well-done! Thank you for sharing your work!
Below is my humble try on a cover. It is supposed to be printed on A4, then cut around the thin gray line to give it tabs and then glued on the outside of a folder. For the file numbers I would use the fonts XBAND Rough or Trixie Plain which can be found for free. For the file name probably a font like Arial Bold. I attach a screencaps from episodes as referense.
But we have seen that there is not just one form to how an X-File looks, there were many different designs on the show. I would say nothing can be regarded as unacceptable and it all depends on the creativity and imagination of the fan who creates it.
During the 90s I used to make (just for me) some X-Files for various episodes using a cover like the one bellow As file numbers I would use the production codes (i.e. #1X79, or #3X24/4X01, #6ABX22/7ABX03-04), in the rare occasion that an X-File file number was given, I would add it to the tab on the side (X 129202 was the number for Tooms). I would also add the file name like in the screencap below (i.e. BIOGENESIS). The original air date of the episode would also be written on the side tab using the XBAND Rough font. Inside the folder I would put a printed synopsis and the cast and crew details of the episode(s) that could be found in the episode guide of the official X-Files website (xfiles.com) and I would also include a transcript of the episode(s) from Inside|The|X: The X-Files Transcripts Archive that I would format accordingly to look as if they belonged in an X-File. I was very young and it was a very fun and nerdy hobby, I spent hours and a lot of paper and ink doing it.