Account for Windows quirks in preview

README.md

@@ -52,6 +52,9 @@ Most AI coding tools pull you out of your editor — into a browser, a chat wind
 - [Claude Code CLI](https://docs.anthropic.com/en/docs/claude-code) installed and in `$PATH`
 - Optional: `+popupwin` for floating window mode
 - Optional: `python3` for diff preview (`:Claude preview`)
+  - Note: In Windows, there is a default python3 that redirects to the Windows Store.
+    Run `Claude doctor` to check if you have a valid python3 installation.
+    If you have Python 3, but your installation uses python.exe as the executable, create a python3 symlink.
 
 ## Installation
 

autoload/claude_code/diff.vim

@@ -18,6 +18,9 @@ let s:diff_bufs = []
 let s:poll_timer = -1
 let s:trigger_dir = ''
 let s:plugin_root = fnamemodify(resolve(expand('<sfile>:p')), ':h:h:h')
+if has('win32')
+  let s:plugin_root = substitute(s:plugin_root, '\\', '/', 'g')
+endif
 
 " ---------------------------------------------------------------------------
 " Polling — file-based IPC for hook → Vim communication
@@ -350,7 +353,16 @@ function! claude_code#diff#check_deps() abort
   let l:results = []
 
   if executable('python3')
-    call add(l:results, '[OK]   python3 found')
+    if has('win32')
+      let l:ver = systemlist('python3 --version')[0]
+      if l:ver =~# '^Python 3\.'
+        call add(l:results, '[OK]   python3 found (' . l:ver . ')')
+      else
+        call add(l:results, '[FAIL] python3 found but version is not 3.x (' . l:ver . ')')
+      endif
+    else
+      call add(l:results, '[OK]   python3 found')
+    endif
   else
     call add(l:results, '[FAIL] python3 not found — required for diff preview')
   endif