I'm running Windows 10 on the problem computer (Dell Inspiron 11-3000), 10 and 7 on the others. All are Home versions fully updated.
The problem computer can see and access other computers on the Workgroup with either wifi (the internal b/g/n and the USB a/c regardless of whether they are on the 2.4 of 5G bands.
Both of those computers can see and access files on the problem computer when connected on the internal b/g/n but cannot see or access that computer when connected only on the USB 5G a/c adapter.
Thanks in advance for suggestions or a heads up that it just can't be done.
Relevant ipconfig info:
Windows IP Configuration
Host Name . . . . . . . . . . . . . . . : 11-300
Primary Dns Suffix . . . . . . . . :
Node Type . . . . . . . . . . . . . . .: Peer-Peer
IP Routing Enabled. . . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : hsd1.tx.comcast.net
Wireless LAN adapter Wi-Fi 2:
Connection-specific DNS Suffix . : hsd1.tx.comcast.net
Description . . . . . . . . . . . : TP-Link Wireless USB Adapter
Physical Address. . . . . . . . . : 18-D6-C7-11-D6-0C
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2601:2c6:4300:21ba::d47b(Preferred)
Lease Obtained. . . . . . . . . . : Wednesday, August 15, 2018 7:23:38 PM
Lease Expires . . . . . . . . . . : Wednesday, August 22, 2018 6:34:39 PM
IPv6 Address. . . . . . . . . . . : 2601:2c6:4300:21ba:c446:dbc3:3443:4f46(Preferred)
Temporary IPv6 Address. . . . . . : 2601:2c6:4300:21ba:d127:a9da:47c:c431(Preferred)
Link-local IPv6 Address . . . . . : fe80::c446:dbc3:3443:4f46%8(Preferred)
IPv4 Address. . . . . . . . . . . : 10.0.0.196(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Wednesday, August 15, 2018 7:23:36 PM
Lease Expires . . . . . . . . . . : Thursday, August 23, 2018 1:27:25 PM
Default Gateway . . . . . . . . . : fe80::f60e:83ff:fed6:c09f%8
10.0.0.1
DHCP Server . . . . . . . . . . . : 10.0.0.1
DHCPv6 IAID . . . . . . . . . . . : 421058247
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-22-A8-F8-2A-FC-01-7C-05-2A-D3
DNS Servers . . . . . . . . . . . : 2001:558:feed::1
2001:558:feed::2
75.75.75.75
75.75.76.76
NetBIOS over Tcpip. . . . . . . . : Disabled
Wireless LAN adapter Wi-Fi:
Connection-specific DNS Suffix . : hsd1.tx.comcast.net
Description . . . . . . . . . . . : Qualcomm QCA9565 802.11b/g/n Wireless Adapter
Physical Address. . . . . . . . . : FC-01-7C-05-2A-D3
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2601:2c6:4300:21ba::5848(Preferred)
Lease Obtained. . . . . . . . . . : Wednesday, August 15, 2018 7:24:32 PM
Lease Expires . . . . . . . . . . : Wednesday, August 22, 2018 6:53:51 PM
IPv6 Address. . . . . . . . . . . : 2601:2c6:4300:21ba:4074:35a9:33c2:4383(Preferred)
Temporary IPv6 Address. . . . . . : 2601:2c6:4300:21ba:2dc4:9ac7:c7bb:2b14(Preferred)
Link-local IPv6 Address . . . . . : fe80::4074:35a9:33c2:4383%16(Preferred)
IPv4 Address. . . . . . . . . . . : 10.0.0.145(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Wednesday, August 15, 2018 7:24:29 PM
Lease Expires . . . . . . . . . . : Thursday, August 23, 2018 1:27:57 PM
Default Gateway . . . . . . . . . : fe80::f60e:83ff:fed6:c09f%16
10.0.0.1
DHCP Server . . . . . . . . . . . : 10.0.0.1
DHCPv6 IAID . . . . . . . . . . . : 100401532
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-22-A8-F8-2A-FC-01-7C-05-2A-D3
DNS Servers . . . . . . . . . . . : 2001:558:feed::1
2001:558:feed::2
75.75.75.75
75.75.76.76
NetBIOS over Tcpip. . . . . . . . : Enabled