How to import existing translations from text file?

Currently testing Passolo and trying any way possible to import already translated text (from previously used program). I have it in TMX, various formats of CSV and TXT. I always get 'Unspecified error'. Any hints as to how the file should be set up (formatted)?

 

This is the format I am trying. The spaces shown here are actually [TAB] characters in the file, written in unicode utf16.

 

vvvvvvvvv----------Begin file-----------vvvvvvvvvvvvv

ID    deu    enu
211    &Sonstiges    &Other
111    &Speichern\tStrg+S    &Save\tCtrl+S
1002    &Splines    S&plines
1157    &Sport Systeme    &Sport systems

^^^^-----------ETC ETC ETC---------------^^^^^^