https://blackmesalabs.wordpress.com/2016/10/24/sump2-96-msps-logic-analyzer-for-22/

[BML_sump2] / sump2_bug_report.txt

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+2016_10_29.01 : bd_server.py AUTO detect fails to work for FTDI VCP.\r
+  Description: \r
+    bd_server "AUTO" for COM# detection only works if launching \r
+    from command line. This also prevents sump2_launch.bat from working.        Workaround: \r
+    Workaround is to hard code the COM port. Replace AUTO with COM99 where \r
+    99 is VCP COM port number assigned by Windows. \r
+  Analysis: \r
+    Underlying problem is Python on Windows with         serial.tools.list_ports.comports(), it appears to ONLY report FTDI is \r
+    the description when launched from a DOS box. \r
+  Resolution:\r
+    This is a Windows specific problem and a very low priority as Windows \r
+    has many other issues with VCP assignments. It is beneficial to be able\r
+    to know how to enable VCP and know what COM# was assigned.\r