Fabric Doesn't Like TSV Extension?

[Shawn_Eary]

I often give my Tab Separated Values files a TSV extension. Fabric doesn't seem to want to allow me to open the file:

Should I stop giving my Tab Separated Values files a TSV extension and instead give them a CSV extension?

[Shawn_Eary]

Interestingly, I renamed the file mentioned above from a TSV extention to have a CSV extention. Then when I tried to load it, the Separator Input Box would not let me enter a tab character:

So now, I technically have two questions. 

1. The question above regarding if it's approprite to end Tab Separated Values files with a TSV extension when using MS Fabric.
2. The question here were I ask how I can specifiy the tab as the separator for Tab Specified Values files.

I guess the workaround for both questions right now is to end all files with the CSV extension and use the | character to separate values. The files are comming to me in CSV format, but I guess I can use Excel to quicky convert them to "CSV" using the | as separator.