In Mathematica 10.0.0 for Windows, I have experienced similar problems.
When non-ASCII characters were placed after \ in a string, they were decoded in a strange way. (Character '' is used as a path separator in Windows).
ToCharacterCode["\\a", "Unicode"](*OK*) {92, 97} ToCharacterCode["\\", "Unicode"](*OK*) {92} ToCharacterCode["μ", "Unicode"](*OK*) {956} ToCharacterCode["\\μ", "Unicode"](*Strange!*) {92, 92, 58, 48, 51, 98, 99}
"μ" in this expample can be some Chinese/Japanese characters. It makes a severe problem because this sometimes happens in file path such as "C:\MyData\μ-channel\" in Windows. IYou could avoid this problem by using "c:/MyData/μ-channel/".