H T C Smart Phone: Text File With Unknown Meaning

[gl556tr]

I have been given a used H T C smart phone. On connecting it to my P.C to re-charge its battery, a text file "nmdsdcid" was displayed.
Its contents were even more mysterious: "{C77F18F6-0062-47DE-A1E3-0AA7F924E3E5}".
--> In both cases, the name and contents are in my inverted commas.
Does anybody know what any of this means?

[Guilbert53]

Search the web for the file name it is mentioned on a few web sites.

Seems to be related to people who download and play mp3 music files on their phone.

It is a "system" file, created and used by the phone (file also used on computers)

More here

https://forum.xda-developers.com/htc-one-m8/help/file-nmdsdcid-file-extension-38-bytes-t2968499

[gl556tr]

G: Thank you for the informative link - sufficient to know that this file 'belongs' in the phone's memory.