Unable to load required component 'Unicows.dll'

英語版 Windows/Adobe Acrobat Reader を使用している外国人社員と PDF 文書を交換したく、日本語版 Windows XP Professional SP1a/Microsoft Word 2003/Adobe Acrobat 7.0 for Windows を用いて PDFMaker 経由で作成した PDF ファイルを上述英語環境(Acrobat Reader 6.0/7.0)で開くと "Unable to load required component 'Unicows.dll'" というエラーが表示され、開く事が出来ません。この障害はエクスプローラーから PDF ファイルをダブルクリックで開くと生じますが、Acrobat Reader 起動後に File -> Open によって PDF ファイルを開くと生じません。

解決しました。
問題は Acrobat では無く、当方の環境に有りました。
日本語版 Windows XP を host OS とし、英語版 Windows XP を guest OS として、host OS 上の C:¥TEMP フォルダーを VMware の host share holder 機能を利用して guest OS に見せていたのですが、この folder を Exploler で参照すると、当該メッセージを出力する事が判明しました。
推測するに、Exploler にはアクセス対象のファイルシステム属性を判断する機能があり、日本語 Windows XP 上では Unicows.dll を必要としないが、(本来 SBCS 環境である)英語 Windows XP では勘違いして Unicows.dll を読み込もうとする模様です(御承知の通り、Windows 2000 以降には Unicows.dll は存在しません)。

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