Assume that $M$ is an open connected manifold?Edit: According to the interesting comments of Michael Albanese and Nick L we revise the question as follows:
Is thereBy manifold compactification of a manifold (not necessarily one point) compactification$M$ we mean a compact manifold $\tilde{M}$ ofwhich contains $M$ such as an open dense subset.
Assume that $\tilde{M}$$M$ is an open connected manifold which admits a manifold? compactification. If yes, can we find suchDoes $\tilde{M}$$M$ necessarily admit a manifold compactification with zero Euler characteristic?