bug

Due to security restrictions we do not accept documents that contain potential malware or that can activate malware when opened. The following formats are blocked:

– .DOC, .DOT, .DOCM, .DOTM
– .XLA, .XLS, .XLT, .XLSB, .XLSM, .XLTM, .XLAM
– .PPT, .PPTM, .POTM, .PPSM, .PPAM, .PPA
– executable files and formats and batch or script languages

Please use .DOCX, .XLSX, .PPTX or .PDF instead.

More information (in German) can be found here:
https://www.bsi.bund.de/DE/Themen/ITGrundschutz/ITGrundschutzKompendium/umsetzungshinweise/APP/Umsetzungshinweise_zum_Baustein_APP_1_1_Office-Produkte.html