FAQ.md

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 # Backbone
 * **I have recently downloaded backbone, but it does not work with the Input files from the backbone Wiki**
     * The example data is prepared for the dev-branch of backbone. How to download it, you find here: https://gitlab.vtt.fi/backbone/backbone/-/wikis/Getting-started/Quick-Start
+    * The newest VTT-files do not use "--input_file" to mark the input-file, but "--input_file_excel". Try using this parameter instead.
 * **When typing in the path to my input data in the command line of GAMS studio, the font becomes red and I get an error when executing backbone.**
     * Check your command for spelling mistakes and unwanted spaces. The path to your data may also not contain spaces.
 * **I set a constraint (like emissionCap) to 0, but backbone seems to ignore it.**
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 * **Sometimes my results are not updated even though I have changed the input file and run backbone again.**
     * In the option files of VTT in 1_options.gms behind gdxxrw (this is the tool which converts xlsx into gdx) the parameter CheckDate is located. This ensures that the inputData.gdx is only rewritten if it is older than your input file. Sometimes there can be problems with the "last used" timestamps and inputData.gdx is not rewritten. You can either remove the inputData.gdx manually or remove the CheckDate parameter in 1_options.gms.
 
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 # Pypsa-eur
 * **When using pypsa-eur, I get the error "symbolic privilege not held".**
     * You must run the shell you are using as administrator.