diff --git a/lua/sidekick/cli/actions.lua b/lua/sidekick/cli/actions.lua
index b8404d1..11ddc62 100644
--- a/lua/sidekick/cli/actions.lua
+++ b/lua/sidekick/cli/actions.lua
@@ -47,6 +47,16 @@ local function nav(dir)
   return function(terminal)
     local at_edge = vim.fn.winnr() == vim.fn.winnr(dir)
     if at_edge or terminal:is_float() then
+      -- When running under a mux backend (e.g., tmux via psmux on Windows),
+      -- returning the key as an expr string passes through Neovim's terminal
+      -- emulation, which can mangle control characters (e.g., C-j becomes CR).
+      -- Send the key directly to the mux pane instead.
+      if terminal.parent and terminal.parent.send_key then
+        vim.schedule(function()
+          terminal.parent:send_key(("C-%s"):format(dir))
+        end)
+        return
+      end
       return ("<c-%s>"):format(dir)
     end
     vim.schedule(function()
diff --git a/lua/sidekick/cli/context/location.lua b/lua/sidekick/cli/context/location.lua
index d1a8dbb..1f62248 100644
--- a/lua/sidekick/cli/context/location.lua
+++ b/lua/sidekick/cli/context/location.lua
@@ -19,14 +19,14 @@ function M.get(ctx, opts)
   opts.kind = opts.kind or "position"
   assert(ctx.buf or ctx.name, "Either buf or name must be provided")
 
-  local name = ctx.name or vim.api.nvim_buf_get_name(ctx.buf)
+  local name = vim.fs.normalize(ctx.name or vim.api.nvim_buf_get_name(ctx.buf))
   if not name or name == "" then
     name = "[No Name]"
   else
-    local cwd = ctx.cwd or vim.fn.getcwd(0)
+    local cwd = ctx.cwd or vim.fs.normalize(vim.fn.getcwd(0))
     local ok, rel = pcall(vim.fs.relpath, cwd, name)
     if ok and rel and rel ~= "" and rel ~= "." then
-      name = rel
+      name = rel:gsub("\\", "/")
     end
   end
 
diff --git a/lua/sidekick/cli/session/tmux.lua b/lua/sidekick/cli/session/tmux.lua
index 942ed7d..755de7f 100644
--- a/lua/sidekick/cli/session/tmux.lua
+++ b/lua/sidekick/cli/session/tmux.lua
@@ -30,11 +30,25 @@ end
 ---@return sidekick.cli.terminal.Cmd?
 function M:start()
   if not self.external then
-    local cmd = { "tmux", "new", "-A", "-s", self.id }
+    -- Sanitize session name: replace spaces with hyphens for psmux/Windows compatibility
+    local session_name = self.id:gsub("%s+", "-")
+    self.mux_session = session_name
+    local cmd = { "tmux", "new", "-A", "-s", session_name }
     vim.list_extend(cmd, { "-c", self.cwd })
     self:add_cmd(cmd)
-    vim.list_extend(cmd, { ";", "set-option", "status", "off" })
-    vim.list_extend(cmd, { ";", "set-option", "detach-on-destroy", "on" })
+    if vim.fn.has("win32") == 1 then
+      -- On Windows (psmux), ";" command chaining is not supported.
+      -- PowerShell interprets ";" as a statement separator, causing
+      -- "set-option" to be run as a standalone cmdlet (which fails).
+      -- Instead, run set-option as separate commands after the session starts.
+      vim.defer_fn(function()
+        vim.fn.system({ "tmux", "set-option", "-t", session_name, "status", "off" })
+        vim.fn.system({ "tmux", "set-option", "-t", session_name, "detach-on-destroy", "on" })
+      end, 1000)
+    else
+      vim.list_extend(cmd, { ";", "set-option", "status", "off" })
+      vim.list_extend(cmd, { ";", "set-option", "detach-on-destroy", "on" })
+    end
     return { cmd = cmd }
   elseif Config.cli.mux.create == "window" then
     local cmd = { "tmux", "new-window", "-dP", "-c", self.cwd, "-F", PANE_FORMAT }
@@ -186,6 +200,14 @@ function M:submit()
   Util.exec({ "tmux", "send-keys", "-t", self.tmux_pane_id, "Enter" })
 end
 
+---Send a raw key to a tmux pane
+---@param key string tmux key name (e.g., "C-j", "Enter", "Escape")
+function M:send_key(key)
+  if self.mux_session then
+    Util.exec({ "tmux", "send-keys", "-t", self.mux_session, key })
+  end
+end
+
 function M:dump()
   local pane_id = self:pane_id()
   if not pane_id then