文件选择不了打开方式??

情况1:启动易的注册表项被修改,注册表没有它的信息(修正注册表)
情况2:主程序文件损坏(重装)
情况3:你用的是绿色版,曾经将其移动位置(重新修正放置原路径),诂计这样居多.
情况4:病毒(杀毒)机会较微

请说明白一点，最好有贴图，OK？

你的应用程序被删了
找安装程序再安一次试试

先新建文本文档，在该文档中粘贴以下信息：

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\Unknown]
"AlwaysShowExt"=""
"QueryClassStore"=""
[HKEY_CLASSES_ROOT\Unknown\shell]
@="openas"
[HKEY_CLASSES_ROOT\Unknown\shell\openas]
[HKEY_CLASSES_ROOT\Unknown\shell\openas\command]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,72,00,75,00,\
6e,00,64,00,6c,00,6c,00,33,00,32,00,2e,00,65,00,78,00,65,00,20,00,25,00,53,\
00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,00,5c,00,73,00,\
79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,