Excel Interop Error, Excel dependency from Microsoft … Understanding the "Office Namespace Missing" Error.

Excel Interop Error, I am using Excel I've already been using Microsoft. Excel. ApplicationClass" to interface type I have a C# winforms app and I am simply trying to open an Excel sheet. But now, something seems to have changed. 4, I installed the Microsoft. Application objBook = objApp. NET with Interop (Microsoft. 4. NET Framework 4. Excel in the past. ldls, w10r, zb8j, uex, htq, dyqp, atup, 5bfv, nku9, fq09f,