The fix

Author: jonkeane

internal/interpreters/r.go

@@ -511,7 +511,9 @@ func (i *defaultRInterpreter) CreateLockfile(lockfilePath util.AbsolutePath) err
 		cmd = "renv::snapshot()"
 	} else {
 		escaped := strings.ReplaceAll(lockfilePath.String(), `\`, `\\`)
-		cmd = fmt.Sprintf(`renv::snapshot(lockfile="%s")`, escaped)
+		// Use normalizePath to handle Windows paths with spaces and special characters correctly
+		// mustWork=FALSE prevents errors if the path doesn't exist yet
+		cmd = fmt.Sprintf(`renv::snapshot(lockfile=normalizePath("%s", mustWork=FALSE))`, escaped)
 	}
 	args := []string{"-s", "-e", cmd}
 	stdout, stderr, err := i.cmdExecutor.RunCommand(rExecutable.String(), args, i.base, i.log)