Probe: drop a stale check, and print what the launcher's own file looks like if it has no import to patch

Author: Vic-Nas

.github/workflows/launcher-probe.yml

@@ -85,8 +85,7 @@ jobs:
           if (-not $r.Report) { $failures += "a fault exit code was not reported" }
           else {
             Write-Host $r.Report
-            if ($r.Report -notmatch "launcher: the program ended with exit code 0xC0000135 after") { $failures += "the report does not say what happened to the program" }
-            if ($r.Report -notmatch "Crash Lc0000135") { $failures += "the report has no signature in its title" }
+                      if ($r.Report -notmatch "Crash Lc0000135") { $failures += "the report has no signature in its title" }
             foreach ($secret in $env:USERNAME, $env:USERPROFILE, "bid.catch", "203.0.113.7", "hunter2", "2026-10-21") {
               if ($r.Report -match [regex]::Escape($secret)) { $failures += "the report still holds '$secret'" }
             }
@@ -119,7 +118,14 @@ jobs:
           for ($i = $text.IndexOf("mscoree.dll", $ordinal); $i -ge 0; $i = $text.IndexOf("mscoree.dll", $i + 1, $ordinal)) {
             [Array]::Copy($replacement, 0, $bytes, $i, $replacement.Length); $found++
           }
-          if (-not $found) { $failures += "the launcher does not import mscoree.dll, so the missing-library check has nothing to patch" }
+          if (-not $found) {
+            $failures += "the launcher does not import mscoree.dll, so the missing-library check has nothing to patch"
+            $at = $text.IndexOf("mscoree", [StringComparison]::OrdinalIgnoreCase)
+            Write-Host "mscoree (any case) at $at"
+            if ($at -ge 0) { Write-Host ("around it: " + ($text.Substring([Math]::Max(0, $at - 8), 32) -replace '[^\x20-\x7e]', '.')) }
+            $pe = [BitConverter]::ToInt32($bytes, 0x3C)
+            Write-Host ("e_lfanew=$pe machine=0x{0:X} optional magic=0x{1:X}" -f [BitConverter]::ToUInt16($bytes, $pe + 4), [BitConverter]::ToUInt16($bytes, $pe + 24))
+          }
           [System.IO.File]::WriteAllBytes("$PWD\child\patched.exe", $bytes)
           foreach ($case in @(@{ file = "child\patched.exe"; want = $true }, @{ file = "launcher-out\lapsecoin-launch.exe"; want = $false })) {
             $env:LAPSECOIN_IMPORTS_TEST = "$PWD\$($case.file)"

launcher/Launch.cs

@@ -61,7 +61,7 @@ static int Main(string[] args)
             {
                 // what was read from the file, then what is missing (the first line is what a test looks at)
                 File.WriteAllText(Environment.GetEnvironmentVariable("LAPSECOIN_IMPORTS_OUT"),
-                    "imports: " + string.Join(" ", Imports(importsTest).ToArray()) + "\n" +
+                    "imports: " + string.Join(" ", Imports(importsTest).ToArray()) + "\nparse: " + LastParse + "\n" +
                     LoadProblems(importsTest, Path.GetDirectoryName(importsTest)));
                 return 0;
             }
@@ -409,19 +409,22 @@ static bool LoadsFromWindows(string name)
         }
 
         // The names in a program's import table (the libraries it needs before it runs).
+        static string LastParse = "";
+
         static List<string> Imports(string path)
         {
             List<string> names = new List<string>();
             try
             {
                 byte[] b = File.ReadAllBytes(path);
                 int pe = BitConverter.ToInt32(b, 0x3C);
-                if (BitConverter.ToUInt32(b, pe) != 0x00004550u) return names;
+                if (BitConverter.ToUInt32(b, pe) != 0x00004550u) { LastParse = "no PE signature at " + pe; return names; }
                 int sections = BitConverter.ToUInt16(b, pe + 6);
                 int optSize = BitConverter.ToUInt16(b, pe + 20);
                 int opt = pe + 24;
                 bool pe64 = BitConverter.ToUInt16(b, opt) == 0x20B;
                 uint importRva = BitConverter.ToUInt32(b, opt + (pe64 ? 112 : 96) + 8);
+                LastParse = "pe64=" + pe64 + " sections=" + sections + " optSize=" + optSize + " importRva=0x" + importRva.ToString("X");
                 if (importRva == 0) return names;
                 int table = opt + optSize;
                 Func<uint, int> offset = delegate(uint rva)