Register COM objects with the abs path to pythoncomxx.dll

CHANGES.txt

@@ -8,6 +8,9 @@ Note that build 228 was the last version supporting Python 2.
 
 Since build 300:
 ----------------
+* COM objects are now registered with the full path to pythoncomXX.dll, fixes
+  #1704.
+
 * Fix some confusion on how dynamic COM object properties work. The old
   code was confused, so there's a chance there will be some subtle
   regression here - please open a bug if you find anything, but this

com/win32com/server/register.py

@@ -216,16 +216,13 @@ def RegisterServer(clsid,
       # Although now we prefer a 'loader' DLL if it exists to avoid some
       # manifest issues (the 'loader' DLL has a manifest, but pythoncom does not)
       pythoncom_dir = os.path.dirname(pythoncom.__file__)
-      if pythoncom.__file__.find("_d") < 0:
-        suffix = ""
-      else:
-        suffix = "_d"
-      loadername = "pythoncomloader%d%d%s.dll" % (sys.version_info[0], sys.version_info[1], suffix)
-      if os.path.isfile(os.path.join(pythoncom_dir, loadername)):
-        dllName = loadername
-      else:
-        # just use pythoncom.
-        dllName = os.path.basename(pythoncom.__file__)
+      suffix = "_d" if "_d" in pythoncom.__file__ else ""
+      # Always register with the full path to the DLLs.
+      loadername = os.path.join(
+        pythoncom_dir,
+        "pythoncomloader%d%d%s.dll" % (sys.version_info[0], sys.version_info[1], suffix)
+      )
+      dllName = loadername if os.path.isfile(loadername) else pythoncom.__file__
 
     _set_subkeys(keyNameRoot + "\\InprocServer32",
                  { None : dllName,