Internal error: Sub-system: FIO, File: /q****/c***/***/***.cpp, Line: 82 Path name is too long -- must be shorter than 260 characters, due to path name length limitations - Internal error: Sub-system: FIO, File: /q****/c***/***/***.cpp, Line: 82 Path name is too long -- must be shorter than 260 characters, due to path name length limitations Description Due to a problem in Quartus® Prime Software you may see the above error. Quartus does not support long paths when: 1) Any long path operations are attempted by directly calling the command line executables in Powershell. example : running quartus_*.exe on a project with long paths. 2) Any long path operations by Quartus GUI or by command line are attempted via the normal command shell - example: creating a project with long paths. Resolution To work around this problem, create the folder in Powershell first before launching Quartus®. This problem is scheduled to be fixed in a future version of the Quartus Prime Software. Custom Fields values: ['novalue'] Troubleshooting 424558 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro', 'FPGA Dev Tools Quartus II Software'] 18.1 17.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']