Rx-mode injection only works with REG_SZ (causes hangs); REG_MULTI_SZ does not inject as Rx

Problem Summary

Npcap's Rx-mode injection behavior is inconsistent:

• If SendToRxAdapters is added as REG_SZ with \Device\{GUID}, Rx-mode works (Wireshark sees it as Rx), but the script hangs (tested using Scapy's conf.L2socket with sendp()).
• If SendToRxAdapters is added as REG_MULTI_SZ with the same \Device\{GUID} (1 line or multiple), no hang occurs, but the packet only goes out as Tx, not Rx.

This makes Rx-mode practically unusable in production environments where hanging is unacceptable.

Repro Steps

1. Add registry key at: Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\npcap\Parameters

2. Set value:

• REG_SZ: \Device\{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX} → works as Rx, but hangs.
• REG_MULTI_SZ: same device name → no hang, but sends as Tx.

3. Run Scapy script with:
   from scapy.all import sendp, Ether, IP, conf
   conf.iface = "Ethernet" # NIC matching the device GUID
   pkt = Ether()/IP(dst="8.8.8.8")
   sendp(pkt)

4. Observe:
   REG_SZ: script in cmd hangs but appears in pktmon as Rx
   REG_MULTI_SZ: script in cmd completes, but appears in pktmon as Tx

Versions
Npcap: 1.79
Wireshark: 4.4.3
OS: Windows 11 Pro
Tested on multiple interfaces

Expected Behavior
REG_MULTI_SZ should behave the same as REG_SZ — allow Rx-mode injection without hangs.

Additional Notes
Documentation at v0.05-r7 changelog mentions semicolon-separated strings, but current behavior suggests inconsistency.
Using REG_SZ is not viable for production due to app hangs.

Please clarify if:
REG_MULTI_SZ is supposed to be supported for Rx
Any syntax (semicolon-separated or newline) is expected
\Device{GUID} is still required in latest versions

Reproduce the issue using the Npcap registry path under Services\npcap\Parameters, the REG_SZ and REG_MULTI_SZ values, Scapy's conf.L2socket/sendp() example, and pktmon observations. Check the v0.05-r7 changelog for the documented syntax; done means REG_MULTI_SZ supports the intended Rx injection without the REG_SZ hang.