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(working dir), resulting in loading of builtin mscoree.dll.
.NET 2.0+ uses LoadLibraryExW() with short dll name only, resulting in getting
the native one (from system32).

This is the relevant part from P/invoke wrapper trace (mscoree already loaded):

The already loaded module is not considered by loader due to full load path
mismatch:

--- snip ---
0025:Call KERNEL32.LoadLibraryExW(0032ed90 L"C:\\Program Files\\Effexis
Software\\Achieve Planner\\mscoree.dll",00000000,00000008) ret=791b7b63
0025:trace:module:load_dll looking for L"C:\\Program Files\\Effexis
Software\\Achieve Planner\\mscoree.dll" in L"C:\\Program Files\\Effexis
Software\\Achieve
Planner;.;C:\\windows\\system32;C:\\windows\\system;C:\\windows;C:\\windows\\system32;C:\\windows;C:\\windows\\system32\\wbem"
0025:trace:module:get_load_order looking for L"C:\\Program Files\\Effexis
Software\\Achieve Planner\\mscoree.dll"
0025:trace:module:get_load_order got hardcoded default for L"C:\\Program
Files\\Effexis Software\\Achieve Planner\\mscoree.dll"
0025:trace:module:load_builtin_dll Trying built-in L"mscoree.dll"
...
0025:trace:module:load_builtin_callback loaded mscoree.dll 0x18f3d8 0x204f0000
0025:trace:module:load_dll Loaded module L"C:\\Program Files\\Effexis
Software\\Achieve Planner\\mscoree.dll" (builtin) at 0x204f0000
0025:trace:module:process_attach (L"mscoree.dll",(nil)) - START
0025:Call PE DLL (proc=0x204f6e00,module=0x204f0000
L"mscoree.dll",reason=PROCESS_ATTACH,res=(nil))
0025:trace:mscoree:DllMain (0x204f0000, 1, (nil))
0025:Call KERNEL32.DisableThreadLibraryCalls(204f0000) ret=204f5ed0
0025:Ret  KERNEL32.DisableThreadLibraryCalls() retval=00000001 ret=204f5ed0
0025:Ret  PE DLL (proc=0x204f6e00,module=0x204f0000
L"mscoree.dll",reason=PROCESS_ATTACH,res=(nil)) retval=1
0025:trace:module:process_attach (L"mscoree.dll",(nil)) - END
0025:Ret  KERNEL32.LoadLibraryExW() retval=204f0000 ret=791b7b63 
--- snip ---

The already loaded module is taken due to short path match:

--- snip ---
0025:Call KERNEL32.LoadLibraryExW(79511a88 L"mscoree.dll",00000000,00000000)
ret=79517307
0025:trace:module:load_dll looking for L"mscoree.dll" in L"C:\\Program
Files\\Effexis Software\\Achieve
Planner;.;C:\\windows\\system32;C:\\windows\\system;C:\\windows;C:\\windows\\system32;C:\\windows;C:\\windows\\system32\\wbem"
0025:trace:module:load_dll Found L"C:\\windows\\system32\\mscoree.dll" for
L"mscoree.dll" at 0x79170000, count=-1
0025:Ret  KERNEL32.LoadLibraryExW() retval=79170000 ret=79517307 
--- snip ---

With "native-over-builtin":

--- snip ---
0037:Call KERNEL32.LoadLibraryExW(0032ed90 L"C:\\Program Files\\Effexis
Software\\Achieve Planner\\mscoree.dll",00000000,00000008) ret=791b7b63
0037:trace:module:load_dll looking for L"C:\\Program Files\\Effexis
Software\\Achieve Planner\\mscoree.dll" in L"C:\\Program Files\\Effexis
Software\\Achieve
Planner;.;C:\\windows\\system32;C:\\windows\\system;C:\\windows;C:\\windows\\system32;C:\\windows;C:\\windows\\system32\\wbem"
0037:trace:module:get_load_order looking for L"C:\\Program Files\\Effexis
Software\\Achieve Planner\\mscoree.dll"
0037:trace:module:get_load_order_value got standard key n,b for L"mscoree"
0037:trace:module:load_builtin_dll Trying built-in L"mscoree.dll"
...
0037:trace:module:load_builtin_callback loaded mscoree.dll 0x193070 0x32870000
0037:trace:module:load_dll Loaded module L"C:\\Program Files\\Effexis
Software\\Achieve Planner\\mscoree.dll" (builtin) at 0x32870000
0037:trace:module:process_attach (L"mscoree.dll",(nil)) - START
0037:Call PE DLL (proc=0x32883e00,module=0x32870000
L"mscoree.dll",reason=PROCESS_ATTACH,res=(nil))
0037:trace:mscoree:DllMain (0x32870000, 1, (nil))
0037:Call KERNEL32.DisableThreadLibraryCalls(32870000) ret=32882ed0
0037:Ret  KERNEL32.DisableThreadLibraryCalls() retval=00000001 ret=32882ed0
0037:Ret  PE DLL (proc=0x32883e00,module=0x32870000
L"mscoree.dll",reason=PROCESS_ATTACH,res=(nil)) retval=1
0037:trace:module:process_attach (L"mscoree.dll",(nil)) - END
0037:Ret  KERNEL32.LoadLibraryExW() retval=32870000 ret=791b7b63 
--- snip ---

With "native only":

--- snip ---
0041:Call KERNEL32.LoadLibraryExW(0032ed90 L"C:\\Program Files\\Effexis
Software\\Achieve Planner\\mscoree.dll",00000000,00000008) ret=791b7b63
0041:trace:module:load_dll looking for L"C:\\Program Files\\Effexis
Software\\Achieve Planner\\mscoree.dll" in L"C:\\Program Files\\Effexis
Software\\Achieve
Planner;.;C:\\windows\\system32;C:\\windows\\system;C:\\windows;C:\\windows\\system32;C:\\windows;C:\\windows\\system32\\wbem"
0041:trace:module:get_load_order looking for L"C:\\Program Files\\Effexis
Software\\Achieve Planner\\mscoree.dll"
0041:trace:module:get_load_order_value got standard key n for L"mscoree"
0041:warn:module:load_dll Failed to load module L"C:\\Program Files\\Effexis
Software\\Achieve Planner\\mscoree.dll"; status=c0000135
0041:Ret  KERNEL32.LoadLibraryExW() retval=00000000 ret=791b7b63
0041:Call KERNEL32.LoadLibraryExW(0032eae8 L"mscoree.dll",00000000,00000000)
ret=791b7b63
0041:trace:module:load_dll looking for L"mscoree.dll" in L"C:\\Program
Files\\Effexis Software\\Achieve
Planner;.;C:\\windows\\system32;C:\\windows\\system;C:\\windows;C:\\windows\\system32;C:\\windows;C:\\windows\\system32\\wbem"
0041:trace:module:load_dll Found L"C:\\windows\\system32\\mscoree.dll" for
L"mscoree.dll" at 0x79170000, count=-1
0041:Ret  KERNEL32.LoadLibraryExW() retval=79170000 ret=791b7b63
0
--- snip ---

Either enforce "native only" for mscoree on .NET 1.1 or install .NET 2.0 where
the CLR will automatically resolve P/Invoke with short name.

If you go the Mono route you need of course to provide a real implementation
for strong name verification.

Regards

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