The file is corrupt or unreadable /Temp.txt windows error pop-up:
Related to Extrenal NFC Drive.
Usually, a sporadic pop up that happens throughout the day at random intervals. Related to external NFC drive. Navigate to File Explorer > This PC to see list of hard drives. Look for the smallest file size drive and you should see Temp.txt somewhere when you open the drive in the root folder.
It reads as a corrupt file at 0KB and can not be deleted. Can only be solved by running a Chkdsk. Right click the drive > Navigate to properties > Scan and fix drive issues.